Cisco Security Advisory
HTTP/2 Rapid Reset Attack Affecting Cisco Products: October 2023
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CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:X/RL:X/RC:X
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On October 10, 2023, the following HTTP/2 protocol-level weakness, which enables a novel distributed denial of service (DDoS) attack technique, was disclosed:
CVE-2023-44487: HTTP/2 Rapid Reset
For a description of this vulnerability, see the following publications:
- How it works: The novel HTTP/2 'Rapid Reset' DDoS attack (Google)
- HTTP/2 Zero-Day vulnerability results in record-breaking DDoS attacks (Cloudflare)
- CVE-2023-44487 - HTTP/2 Rapid Reset Attack (AWS)
This advisory is available at the following link:
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-http2-reset-d8Kf32vZ
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Cisco investigated its product line to determine which products may be affected by this vulnerability.
The Vulnerable Products section includes Cisco bug IDs for each affected product. The bugs are accessible through the Cisco Bug Search Tool and contain additional platform-specific information, including workarounds (if available) and fixed software releases.
Any product not listed in the Vulnerable Products section of this advisory is to be considered not vulnerable.
Cisco cloud-based offering have been remediated as required.
Vulnerable Products
The following table lists Cisco products that are affected by the vulnerability that is described in this advisory. If a future release date is indicated for software, the date provided represents an estimate based on all information known to Cisco as of the Last Updated date at the top of the advisory. Availability dates are subject to change based on a number of factors, including satisfactory testing results and delivery of other priority features and fixes. Customers should refer to the associated Cisco bug(s) for further details.
Product Cisco Bug ID Fixed Release Availability Network and Content Security Devices Firepower Threat Defense (FTD) (Streaming Telemetry DIAL-IN mode feature) CSCwi12388 7.4.2 (Apr 2024) Secure Dynamic Attribute Connector (CSDAC) CSCwh89890 2.2.0
2.3.0Secure Malware Analytics Appliance, formerly Threat Grid Appliance CSCwh88721 2.19.2 (Feb 2024) Secure Web Appliance, formerly Web Security Appliance (WSA) CSCwh88595 15.1.0 GA (Dec 2023)
15.2.0Network Management and Provisioning Business Process Automation CSCwh88580 3.2.003.009 (Nov 2023)
4.0.001.003 (Nov 2023)
4.0.002.003 (Nov 2023)Crosswork Data Gateway CSCwh88729 4.1.3 (Dec 2023)
5.0.2 (Dec 2023)
6.0.0Crosswork Situation Manager CSCwh88658 Contact Cisco TAC for upgrade options Crosswork Zero Touch Provisioning (ZTP) CSCwh88727 6.0.0 (Dec 2023) Data Center Network Manager (DCNM) - SAN Deployments on Windows or Linux CSCwh88607 Apply Workaround IoT Field Network Director, formerly Connected Grid Network Management System CSCwh88604 4.11.0 Prime Access Registrar CSCwh88632 9.3.3 (Feb 2024) Prime Cable Provisioning CSCwh91177 7.2.1 (Nov 2023) Prime Infrastructure CSCwh84581 3.10.4 Prime Network Registrar CSCwh88631 11.2 Routing and Switching - Enterprise and Service Provider IOS XE Software (gNMI Server feature) CSCwi23471 17.15.1 (Aug 2024) IOS XR Software (gRPC Protocol server feature) CSCwi23456 7.11.2 (Feb 2024)
24.1.1 (Feb 2024)IOx Fog Director CSCwh89927 1.22 (Nov 2023) Nexus 3000 Series Switches (NX-API feature) CSCwh88614 10.2(7) (Feb 2024)
10.3(5) (May 2024)
10.4(2)Nexus 3000 Series Switches (gRPC Agent feature) CSCwi13890 10.4(3) (Mar 2024) Nexus 9000 Series Switches in standalone NX-OS mode (NX-API feature) CSCwh88614 10.2(7) (Feb 2024)
10.3(5) (May 2024)
10.4(2)Nexus 9000 Series Switches in standalone NX-OS mode (gRPC Agent feature) CSCwi13890 10.4(3) (Mar 2024) Ultra Cloud Core - Policy Control Function CSCwh88574 2024.01.0 (Feb 2024) Ultra Cloud Core - Serving Gateway Function CSCwi11657 2024.02.0 (May 2024) Ultra Cloud Core - Session Management Function CSCwh88576 2024.02.0 (May 2024) Voice and Unified Communications Devices Enterprise Chat and Email CSCwh88749 Apply Microsoft Windows Update or Workaround Unified Attendant Console Advanced CSCwh88736 Apply Microsoft Windows Update or Workaround Unified Contact Center Domain Manager (CCDM) CSCwh88737 Apply Microsoft Windows Update or Workaround Unified Contact Center Enterprise (UCCE) CSCwh88584 Apply Microsoft Windows Update or Workaround Unified Contact Center Enterprise - Live Data server CSCwh88583 12.6.2 (Nov 2023) Unified Contact Center Management Portal (CCMP) CSCwh88737 Apply Microsoft Windows Update or Workaround Video, Streaming, TelePresence, and Transcoding Devices Expressway Series CSCwh88665 X14.3.3 TelePresence Video Communication Server (VCS) CSCwh88665 X14.3.3 Wireless Connected Mobile Experiences CSCwh89894 11.1 (Feb 2024) Products Confirmed Not Vulnerable
Only products listed in the Vulnerable Products section of this advisory are known to be affected by this vulnerability.
Cisco has confirmed that this vulnerability does not affect the following Cisco products:
Cable Devices
- GS7000 Nodes
- RF Gateway 1 (RFGW-1)
- RF Gateway 10
- Remote PHY 120
Collaboration and Social Media
- Customer Collaboration Platform, formerly SocialMiner
Meraki Products
- Meraki Go Series
- Meraki MR Series Cloud-Managed Wireless Access Points
- Meraki MS Series Switches
- Meraki MT Series Sensors
- Meraki MV Series Cloud-Managed Smart Cameras
- Meraki MX Series Cloud-Managed Security and SD-WAN
- Meraki Z-Series Cloud-Managed Teleworker Gateway
Network Application, Service, and Acceleration
- Cloud Services Platform 2100
- Cloud Services Platform 5000 Series
- Industrial Network Director
- Nexus Dashboard Data Broker, formerly Nexus Data Broker
- Nexus Dashboard Insights
- Secure Workload, formerly Tetration
- Smart Software Manager On-Prem
- Wide Area Application Services (WAAS)
Network and Content Security Devices
- Adaptive Security Appliance (ASA) Software
- Adaptive Security Device Manager (ASDM)
- Advanced Web Security Reporting Application
- FXOS Firepower Chassis Manager
- Firepower Device Manager (FDM)
- Firepower Management Center (FMC)
- Identity Services Engine (ISE)
- Secure Email and Web Manager, formerly Content Security Management Appliance (SMA)
- Secure Email, formerly Email Security Appliance (ESA)
- Secure Endpoint Private Cloud, formerly AMP Virtual Private Cloud Appliance
- Secure Firewall Cloud Native (SFCN)
- Secure Network Analytics, formerly Stealthwatch
- Secure Services Proxy
- Security Manager
- Umbrella Virtual Appliance
- Virtual Security Gateway
Network Management and Provisioning
- Application Policy Infrastructure Controller (APIC)
- Business Wireless (CBW)
- CX Test Manager (CXTM)
- Cisco Container Platform
- Cisco Evolved Programmable Network Manager (EPNM)
- Cisco Telemetry Broker
- CloudCenter Action Orchestrator
- CloudCenter Cost Optimizer
- CloudCenter Suite Admin
- CloudCenter Workload Manager
- Collaboration Audit and Assessments
- Common Services Platform Collector (CSPC)
- Crosswork Change Automation
- Crosswork Health Insights
- Crosswork Network Controller - Topology
- Crosswork Network Controller
- Crosswork Optimization Engine
- Crosswork Service Health
- Cyber Vision
- DNA Spaces Connector
- Elastic Services Controller (ESC)
- FindIT Network Manager
- Intelligent Node (iNode) Manager
- Managed Services Accelerator
- Modeling Labs
- Network Change and Configuration Management
- Network Services Orchestrator (NSO)
- Network Services Orchestrator - SMI
- Nexus Dashboard Fabric Controller (NDFC)
- Nexus Dashboard Orchestrator (NDO), formerly ACI Multi-Site Orchestrator (MSO)
- Nexus Dashboard, formerly Application Services Engine
- Optical Network Planner
- Policy Suite
- Prime Collaboration Assurance
- Prime Collaboration Deployment
- Prime Collaboration Provisioning
- Prime IP Express
- Prime License Manager
- Prime Network Services Controller
- Prime Network
- Prime Performance Manager
- Prime Service Catalog
- Process Orchestrator
- Smart PHY
- Software-Defined AVC (SD-AVC)
- ThousandEyes Enterprise Agent
- Virtual Topology System - Virtual Topology Controller (VTC) VM
- Virtualized Infrastructure Manager
- WAN Automation Engine (WAE)
Routing and Switching - Enterprise and Service Provider
- ACI Virtual Edge
- ASR 5000 Series Routers
- Application Policy Infrastructure Controller Enterprise Module (APIC-EM)
- CGR 1000 Compute Module
- Catalyst Center, formerly Cisco DNA Center
- GGSN Gateway GPRS Support Node
- IP Services Gateway (IPSG)
- MDS 9000 Series Multilayer Switches
- ME 1200 Series Carrier Ethernet Access Devices
- MME Mobility Management Entity
- NCS 2000 Shelf Virtualization Orchestrator (SVO)
- Network Convergence System 1004
- Network Convergence System 2000 Series
- Nexus 5500 Platform Switches
- Nexus 5600 Platform Switches
- Nexus 6000 Series Switches
- Nexus 7000 Series Switches
- Nexus 9000 Series Fabric Switches in ACI mode
- ONS 15454 Series Multiservice Provisioning Platforms
- Optical Network Controller
- PDSN/HA Packet Data Serving Node and Home Agent
- PGW Packet Data Network Gateway
- System Architecture Evolution Gateway (SAEGW)
- Ultra Cloud Core - Access and Mobility Management Function
- Ultra Cloud Core - Redundancy Configuration Manager
- Ultra Cloud Core - Subscriber Microservices Infrastructure
- Ultra Cloud Core - User Plane Function
- Ultra Packet Core
- Ultra Services Platform
Routing and Switching - Small Business
- 220 Series Smart Plus Switches
- 250 Series Smart Switches
- 300 Series Managed Switches
- 350/350X/550X Series Switches
- Business 220 Series Smart Switches
- Business 250 Series Smart Switches
- Business 350 Series Managed Switches
- Cisco Business Dashboard
- RV042 Dual WAN VPN Router
- RV042G Dual Gigabit WAN VPN Router
- RV110W Wireless-N VPN Firewall
- RV130 Series VPN Routers
- RV132W ADSL2+ Wireless-N VPN Router
- RV134W VDSL2 Wireless-AC VPN Router
- RV160 VPN Router
- RV160W Wireless-AC VPN Router
- RV160x VPN Router
- RV215W Wireless-N VPN Router
- RV260 VPN Routers
- RV260P VPN Router with PoE
- RV260W Wireless-AC VPN Router
- RV260x VPN Router
- RV320 Dual Gigabit WAN VPN Router
- RV325 Dual WAN VPN Router
- RV340W Dual WAN Gigabit Wireless-AC VPN Router
Unified Computing
- Enterprise NFV Infrastructure Software (NFVIS)
- HxBench
- HyperFlex Storage Replication Adapter
- HyperFlex System
- HyperFlex Workload Profiler
- Integrated Management Controller (IMC) Supervisor
- Intersight Virtual Appliance
- UCS C-Series Rack Servers and S-Series Storage Servers - Integrated Management Controller (CIMC)
- UCS Central Software
- UCS Director Bare Metal Agent
- UCS Director
- UCS E-Series Servers
- UCS Manager
Voice and Unified Communications Devices
- ATA 190 Analog Telephone Adapter
- ATA 190 Series Multiplatform Analog Telephone Adapters
- ATA 191 Analog Telephone Adapter
- BroadWorks
- Cloud Connect
- Emergency Responder
- Finesse
- Hosted Collaboration Mediation Fulfillment
- IP Conference Phone 7832
- IP Conference Phone 8832
- IP Conference Phone 8832 with Multiplatform Firmware
- IP DECT 110 Repeater with Multiplatform Firmware
- IP DECT 110 Single-Cell Base Station with Multiplatform Firmware
- IP DECT 210 Multi-Cell Base Station with Multiplatform Firmware
- IP DECT 6823 with Multiplatform Firmware
- IP DECT 6825 with Multiplatform Firmware
- IP Phone 6800 Series with Multiplatform Firmware
- IP Phone 7800 Series
- IP Phone 7800 Series with Multiplatform Firmware
- IP Phone 8800 Series
- IP Phone 8800 Series with Multiplatform Firmware
- Jabber Guest
- Paging Server
- SPA112 2-Port Phone Adapter
- SPA122 Analog Telephone Adapter (ATA) with Router
- SPA232D Multi-Line DECT Analog Telephone Adapter (ATA)
- SPA300 Series IP Phones
- SPA8800 IP Telephony Gateway
- Unified Attendant Consoles (except Advanced Version)
- Unified Communications Manager
- Unified Communications Manager IM & Presence Service
- Unified Communications Manager Session Management Edition
- Unified Contact Center Express (UCCX)
- Unified Customer Voice Portal
- Unified IP Conference Phone 8831
- Unified IP Conference Phone 8831 for Third-Party Call Control
- Unified IP Phone 3905
- Unified IP Phone 6901
- Unified IP Phone 6911
- Unified Intelligence Center
- Unified SIP Proxy Software
- Unity Connection
- Unity Express
- Video Phone 8875
- Virtualized Voice Browser
- Webex Hybrid Data Security Node
- Webex Room Phone
- Webex Share
- Webex Video Mesh
- Webex Wireless Phones 840 and 860
- Wireless IP Phone 8821
Video, Streaming, TelePresence, and Transcoding Devices
- Board Series
- Cisco Meeting Management
- Cisco Meeting Server
- Cisco Vision Dynamic Signage Director
- Desk Series
- Room Series
- TelePresence ISDN Link
- TelePresence Management Suite
- Webex Board
- Webex DX80
Wireless
- Aironet 1700 Series Access Points
- Aironet 1800 Series Access Points
- Aironet 1810 Series OfficeExtend Access Points
- Aironet 2700 Series Access Points
- Aironet 2800 Series Access Points
- Aironet 3700 Series Access Points
- Aironet 3800 Series Access Points
- Industrial Wireless 3700 Series Access Points
- Mobility Services Engine Software
- Ultra-Reliable Wireless Backhaul
- WAP121 Wireless-N Access Point with Single Point Setup
- WAP125 Wireless-AC Dual Band Desktop Access Point with PoE
- WAP150 Wireless-AC/N Dual Radio Access Point with PoE
- WAP361 Wireless-AC/N Dual Radio Wall Plate Access Point with PoE
- WAP371 Wireless-AC/N Access Point with Single Point Setup
- WAP571 Wireless-AC/N Premium Dual Radio Access Point with PoE
- WAP571E Wireless-AC/N Premium Dual Radio Outdoor Access Point
- WAP581 Wireless-AC Dual Radio Wave 2 Access Point with 2.5GbE LAN
- WRP500 Wireless-AC Broadband Router
- Wireless Gateway for LoRaWAN
- Wireless LAN Controller
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For potential workarounds on a specific Cisco product, refer to the Cisco bug ID, available from the Cisco Bug Search Tool.
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For information about fixed software releases, consult the Cisco bugs identified in the Vulnerable Products section of this advisory.
When considering software upgrades, customers are advised to regularly consult the advisories for Cisco products, which are available from the Cisco Security Advisories page, to determine exposure and a complete upgrade solution.
In all cases, customers should ensure that the devices to be upgraded contain sufficient memory and confirm that current hardware and software configurations will continue to be supported properly by the new release. If the information is not clear, customers are advised to contact the Cisco Technical Assistance Center (TAC) or their contracted maintenance providers.
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The Cisco Product Security Incident Response Team (PSIRT) is aware of attempted exploitation of this vulnerability in the wild.
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This vulnerability was publicly disclosed by Google, Cloudflare, and AWS on October 10, 2023.
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To learn about Cisco security vulnerability disclosure policies and publications, see the Security Vulnerability Policy. This document also contains instructions for obtaining fixed software and receiving security vulnerability information from Cisco.
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Show LessVersion Description Section Status Date 1.11 Changed the advisory status to Final. Updated the lists of vulnerable products and products confirmed not vulnerable and fixed releases availability. Header, Summary, Affected Products, Vulnerable Products, and Products Confirmed Not Vulnerable Final 2023-DEC-21 1.10 Updated the lists of vulnerable products and products confirmed not vulnerable and fixed releases availability. Vulnerable Products and Products Confirmed Not Vulnerable Interim 2023-DEC-05 1.9 Updated the lists of vulnerable products and products confirmed not vulnerable. Vulnerable Products and Products Confirmed Not Vulnerable Interim 2023-NOV-17 1.8 Updated the lists of vulnerable products and products confirmed not vulnerable. Vulnerable Products and Products Confirmed Not Vulnerable Interim 2023-NOV-09 1.7 Updated the lists of vulnerable products and products confirmed not vulnerable and fixed releases availability. Vulnerable Products and Products Confirmed Not Vulnerable Interim 2023-NOV-02 1.6 Updated the lists of vulnerable products and products confirmed not vulnerable. Vulnerable Products and Products Confirmed Not Vulnerable Interim 2023-OCT-31 1.5 Updated the lists of vulnerable products and products confirmed not vulnerable. Vulnerable Products and Products Confirmed Not Vulnerable Interim 2023-OCT-26 1.4 Updated the lists of vulnerable products and products confirmed not vulnerable. Vulnerable Products and Products Confirmed Not Vulnerable Interim 2023-OCT-24 1.3 Updated the lists of vulnerable products and products confirmed not vulnerable. Vulnerable Products and Products Confirmed Not Vulnerable Interim 2023-OCT-20 1.2 Corrected bugs. - Interim 2023-OCT-19 1.1 Updated the lists of vulnerable products and products confirmed not vulnerable. Vulnerable Products and Products Confirmed Not Vulnerable Interim 2023-OCT-19 1.0 Initial public release. - Interim 2023-OCT-16
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