CVE-2022-20846

Process reload via heap overflow in CDP messages

Published Nov 15, 2024 · Updated Nov 15, 2024

Heap buffer overflow in Cisco Discovery Protocol in affected Cisco IOS XR Software allows attackers to reload the protocol process. The implementation copies restricted attacker-controlled bytes from a crafted CDP message past a heap buffer boundary. Exploitation requires no authentication but does require CDP to be enabled and the attacker to share the device's Layer 2 broadcast domain; success reloads the CDP process rather than the device.

CVSS severity4.3
Medium
EPSS probability1.00%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap buffer overflow in Cisco Discovery Protocol in affected Cisco IOS XR Software allows attackers to reload the protocol process. The implementation copies restricted attacker-controlled bytes from a crafted CDP message past a heap buffer boundary. Exploitation requires no authentication but does require CDP to be enabled and the attacker to share the device's Layer 2 broadcast domain; success reloads the CDP process rather than the device.

The record

CVE
CVE-2022-20846
Published
Nov 15, 2024
Updated
Nov 15, 2024
Vendor
ClamAV
Product
Cisco IOS XR Software
Classifications
CWE-120, 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

Compare your product and version with the public record. A matching version still requires validation against your environment.

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=6.5.25
  5. Affected versionversion=6.5.26
  6. Affected versionversion=6.5.28
  7. Affected versionversion=6.5.29
  8. Affected versionversion=6.5.3
  9. Affected versionversion=6.5.31
  10. Affected versionversion=6.5.32
  11. Affected versionversion=6.5.90
  12. Affected versionversion=6.5.92
  13. Affected versionversion=6.5.93
  14. Affected versionversion=6.6.1
  15. Affected versionversion=6.6.11
  16. Affected versionversion=6.6.12
  17. Affected versionversion=6.6.2
  18. Affected versionversion=6.6.25
  19. Affected versionversion=6.6.3
  20. Affected versionversion=6.6.4
  21. Affected versionversion=6.7.1
  22. Affected versionversion=6.7.2
  23. Affected versionversion=6.7.3
  24. Affected versionversion=6.7.35
  25. Affected versionversion=6.7.4
  26. Affected versionversion=6.8.1
  27. Affected versionversion=6.8.2
  28. Affected versionversion=6.9.1
  29. Affected versionversion=7.0.0
  30. Affected versionversion=7.0.1
  31. Affected versionversion=7.0.11
  32. Affected versionversion=7.0.12
  33. Affected versionversion=7.0.14
  34. Affected versionversion=7.0.2
  35. Affected versionversion=7.0.90
  36. Affected versionversion=7.1.1
  37. Affected versionversion=7.1.15
  38. Affected versionversion=7.1.2
  39. Affected versionversion=7.1.25
  40. Affected versionversion=7.1.3
  41. Affected versionversion=7.2.0
  42. Affected versionversion=7.2.1
  43. Affected versionversion=7.2.12
  44. Affected versionversion=7.2.2
  45. Affected versionversion=7.3.1
  46. Affected versionversion=7.3.15
  47. Affected versionversion=7.3.16
  48. Affected versionversion=7.3.2
  49. Affected versionversion=7.3.27
  50. Affected versionversion=7.3.3
  51. Affected versionversion=7.3.4
  52. Affected versionversion=7.4.1
  53. Affected versionversion=7.4.15
  54. Affected versionversion=7.4.16
  55. Affected versionversion=7.4.2
  56. Affected versionversion=7.5.1
  57. Affected versionversion=7.5.12
  58. Affected versionversion=7.5.2
  59. Affected versionversion=7.6.1
  60. Affected versionversion=7.6.15

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=6.5.25; version=6.5.26; version=6.5.28; version=6.5.29; version=6.5.3; version=6.5.31; version=6.5.32; version=6.5.90; version=6.5.92; version=6.5.93; version=6.6.1; version=6.6.11; version=6.6.12; 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=6.7.4; version=6.8.1; version=6.8.2; version=6.9.1; version=7.0.0; version=7.0.1; version=7.0.11; version=7.0.12; version=7.0.14; 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=7.2.0; version=7.2.1; version=7.2.12; version=7.2.2; version=7.3.1; version=7.3.15; version=7.3.16; version=7.3.2; version=7.3.27; version=7.3.3; version=7.3.4; version=7.4.1; version=7.4.15; version=7.4.16; version=7.4.2; version=7.5.1; version=7.5.12; version=7.5.2; version=7.6.1; version=7.6.15

Published CVSS scores

4.3CiscoCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
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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