CVE-2022-20849

PPPoE process crash via malformed packet sequence

Published Nov 15, 2024 · Updated Nov 15, 2024

Denial of service in Cisco IOS XR Software allows attackers to continually crash the PPPoE process via crafted adjacent-network packets. The Broadband Network Gateway PPPoE feature mishandles an error condition in a specific non-RFC packet sequence instead of rejecting it safely. Exploitation requires PPPoE to be enabled and control of customer-premises equipment, and repeated process restarts interrupt PPPoE service.

CVSS severity6.1
Medium
EPSS probability0.28%
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 XR Software allows attackers to continually crash the PPPoE process via crafted adjacent-network packets. The Broadband Network Gateway PPPoE feature mishandles an error condition in a specific non-RFC packet sequence instead of rejecting it safely. Exploitation requires PPPoE to be enabled and control of customer-premises equipment, and repeated process restarts interrupt PPPoE service.

The record

CVE
CVE-2022-20849
Published
Nov 15, 2024
Updated
Nov 15, 2024
Vendor
ClamAV
Product
Cisco IOS XR Software
Classifications
CWE-391, T1499.004
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 15, 2024CVE publishedPublication date reported by the CVE source.
  2. Nov 15, 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=6.5.1
  2. Affected versionversion=6.5.15
  3. Affected versionversion=6.5.2
  4. Affected versionversion=6.5.3
  5. Affected versionversion=6.6.1
  6. Affected versionversion=6.6.2
  7. Affected versionversion=6.6.25
  8. Affected versionversion=6.6.3
  9. Affected versionversion=6.6.4
  10. Affected versionversion=6.7.1
  11. Affected versionversion=6.7.2
  12. Affected versionversion=6.7.3
  13. Affected versionversion=6.7.35
  14. Affected versionversion=6.8.1
  15. Affected versionversion=6.8.2
  16. Affected versionversion=6.9.1
  17. Affected versionversion=7.0.1
  18. Affected versionversion=7.0.2
  19. Affected versionversion=7.0.90
  20. Affected versionversion=7.1.1
  21. Affected versionversion=7.1.15
  22. Affected versionversion=7.1.2
  23. Affected versionversion=7.1.25
  24. Affected versionversion=7.1.3
  25. Affected versionversion=7.2.1
  26. Affected versionversion=7.2.2
  27. Affected versionversion=7.3.1
  28. Affected versionversion=7.3.2
  29. Affected versionversion=7.3.3
  30. Affected versionversion=7.3.4
  31. Affected versionversion=7.4.1
  32. Affected versionversion=7.4.2
  33. Affected versionversion=7.5.1

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

ClamAV · Cisco IOS XR Softwareversion=6.5.1; version=6.5.15; version=6.5.2; version=6.5.3; version=6.6.1; version=6.6.2; version=6.6.25; version=6.6.3; version=6.6.4; version=6.7.1; version=6.7.2; version=6.7.3; version=6.7.35; version=6.8.1; version=6.8.2; version=6.9.1; version=7.0.1; version=7.0.2; version=7.0.90; version=7.1.1; version=7.1.15; version=7.1.2; version=7.1.25; version=7.1.3; version=7.2.1; version=7.2.2; version=7.3.1; version=7.3.2; version=7.3.3; version=7.3.4; version=7.4.1; version=7.4.2; version=7.5.1

Published CVSS scores

6.1CiscoCVSS:3.1/AV:A/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.

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No observations available

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

Weakness, pattern, technique

CWE-391Unchecked Error Condition
T1499.004Application or System Exploitation

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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