CVE-2021-1440: Cisco IOS XR Software BGP Resource Public Key Infrastructure Denial of Service Vulnerability
First published: Mon Nov 18 2024(Updated: )
A vulnerability in the implementation of the Resource Public Key Infrastructure (RPKI) feature of Cisco IOS XR Software could allow an unauthenticated, remote attacker to cause the Border Gateway Protocol (BGP) process to crash, resulting in a denial of service (DoS) condition. This vulnerability is due to the incorrect handling of a specific RPKI to Router (RTR) Protocol packet header. An attacker could exploit this vulnerability by compromising the RPKI validator server and sending a specifically crafted RTR packet to an affected device. Alternatively, the attacker could use man-in-the-middle techniques to impersonate the RPKI validator server and send a specifically crafted RTR response packet over the established RTR TCP connection to the affected device. A successful exploit could allow the attacker to cause a DoS condition because the BGP process could constantly restart and BGP routing could become unstable.Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability.This advisory is part of the September 2021 release of the Cisco IOS XR Software Security Advisory Bundled Publication. For a complete list of the advisories and links to them, see .
Credit: ykramarz@cisco.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Cisco IOS XRv 9000 |
Never miss a vulnerability like this again
Sign up to SecAlerts for real-time vulnerability data matched to your software, aggregated from hundreds of sources.
Reference Links
- https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-xrbgp-rpki-dos-gvmjqxbk
- https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-xss-webui-gQLSFyPM
- https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sdwan-sigverbypass-gPYXd6Mk
- https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-esa-sma-info-disclo-VOu2GHbZ
Frequently Asked Questions
What is the severity of CVE-2021-1440?
CVE-2021-1440 is categorized as a high severity vulnerability due to its potential to cause a Denial of Service (DoS) condition.
How do I fix CVE-2021-1440?
To remediate CVE-2021-1440, apply the latest patches provided by Cisco for the affected IOS XR Software versions.
What impact does CVE-2021-1440 have on network security?
CVE-2021-1440 can allow an unauthenticated remote attacker to crash the BGP process, leading to network outages and potential data loss.
Who is affected by CVE-2021-1440?
Organizations using Cisco IOS XR Software, particularly those relying on the RPKI feature, are affected by CVE-2021-1440.
When was CVE-2021-1440 disclosed?
CVE-2021-1440 was disclosed in 2021 as a significant vulnerability affecting Cisco IOS XR Software.
- agent/weakness
- agent/title
- agent/references
- agent/description
- agent/type
- agent/first-publish-date
- agent/severity
- agent/author
- agent/event
- collector/mitre-cve
- source/MITRE
- collector/nvd-api
- source/NVD
- agent/last-modified-date
- agent/source
- agent/tags
- agent/softwarecombine
- agent/guess-ai
- agent/software-canonical-lookup
- agent/software-canonical-lookup-request
- vendor/cisco
- canonical/cisco ios xrv 9000