Cisco IOS XR RPKI RTR Packet Header Crash -> BGP DoS
CVE-2021-1440 Published on November 18, 2024
Cisco IOS XR Software BGP Resource Public Key Infrastructure Denial of Service Vulnerability
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 .
Vulnerability Analysis
CVE-2021-1440 is exploitable with network access, and does not require authorization privileges or user interaction. This vulnerability is consided to have a high level of attack complexity. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality and integrity, and a high impact on availability.
Weakness Type
What is an assertion failure Vulnerability?
The product contains an assert() or similar statement that can be triggered by an attacker, which leads to an application exit or other behavior that is more severe than necessary.
CVE-2021-1440 has been classified to as an assertion failure vulnerability or weakness.
Products Associated with CVE-2021-1440
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Affected Versions
Cisco IOS XR Software:- Version 6.6.1 is affected.
- Version 6.5.3 is affected.
- Version 7.0.1 is affected.
- Version 6.6.11 is affected.
- Version 6.5.1 is affected.
- Version 6.5.2 is affected.
- Version 6.6.2 is affected.
- Version 6.6.12 is affected.
- Version 6.6.25 is affected.
- Version 7.1.1 is affected.
- Version 7.0.90 is affected.
- Version 6.6.3 is affected.
- Version 7.0.2 is affected.
- Version 7.1.2 is affected.
- Version 7.2.1 is affected.
- Version 7.0.11 is affected.
- Version 7.0.12 is affected.
- Version 7.0.14 is affected.
- Version 6.6.4 is affected.
- Version 7.2.12 is affected.
- Version 7.2.2 is affected.
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.