CVE-2022-20694Network attack vector

BGP process crash via malformed RTR header

Published Apr 15, 2022 · Updated Nov 6, 2024

Denial of service in Cisco IOS XE Software allows remote attackers to crash the BGP process via a crafted RPKI RTR packet header. The RPKI implementation incorrectly handles a specific RTR Protocol packet header, causing BGP to restart continuously and destabilizing routing. Exploitation requires an in-use RPKI configuration plus control of the validator server or a man-in-the-middle position on its established TCP connection.

CVSS severity6.8
Medium
EPSS probability1.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in Cisco IOS XE Software allows remote attackers to crash the BGP process via a crafted RPKI RTR packet header. The RPKI implementation incorrectly handles a specific RTR Protocol packet header, causing BGP to restart continuously and destabilizing routing. Exploitation requires an in-use RPKI configuration plus control of the validator server or a man-in-the-middle position on its established TCP connection.

The record

CVE
CVE-2022-20694
Published
Apr 15, 2022
Updated
Nov 6, 2024
Vendor
ClamAV
Product
Cisco IOS XE Software
Classifications
CWE-617, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 15, 2022CVE publishedPublication date reported by the CVE source.
  2. Nov 6, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=n/a

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

ClamAV · Cisco IOS XE Softwareversion=n/a

Published CVSS scores

7.1NISTAV:N/AC:M/Au:N/C:N/I:N/A:C
6.8Cisco Systems, Inc.CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:H/E:X/RL:X/RC:X

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-617Reachable Assertion
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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