CVE-2022-20688

CDP service restart via unvalidated header lengths

Published Dec 7, 2022 · Updated Aug 3, 2024

An out-of-bounds read in Cisco Discovery Protocol handling in Cisco ATA 190 Series firmware allows remote attackers to restart the service. The firmware fails to validate lengths in selected CDP packet header fields before reading packet data. The attacker must share the device's Layer 2 broadcast domain; a successful packet causes an unexpected CDP service restart.

CVSS severity5.3
Medium
EPSS probability0.94%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

An out-of-bounds read in Cisco Discovery Protocol handling in Cisco ATA 190 Series firmware allows remote attackers to restart the service. The firmware fails to validate lengths in selected CDP packet header fields before reading packet data. The attacker must share the device's Layer 2 broadcast domain; a successful packet causes an unexpected CDP service restart.

The record

CVE
CVE-2022-20688
Published
Dec 7, 2022
Updated
Aug 3, 2024
Vendor
ClamAV
Product
Cisco Analog Telephone Adaptor (ATA) Software
Classifications
CWE-125, CWE-1284, T1499
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 7, 2022CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 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=1.1.0
  2. Affected versionversion=1.1.1
  3. Affected versionversion=11.1.0
  4. Affected versionversion=11.1.0 MSR1
  5. Affected versionversion=11.1.0 MSR2
  6. Affected versionversion=11.1.0 MSR3
  7. Affected versionversion=11.1.0 MSR4
  8. Affected versionversion=1.1.2
  9. Affected versionversion=11.2.1
  10. Affected versionversion=12.0.1
  11. Affected versionversion=12.0.1 SR1
  12. Affected versionversion=12.0.1 SR2
  13. Affected versionversion=12.0.1 SR3
  14. Affected versionversion=12.0.1 SR4
  15. Affected versionversion=1.2.1
  16. Affected versionversion=1.2.2
  17. Affected versionversion=1.2.2 SR1
  18. Affected versionversion=1.2.2 SR2

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

ClamAV · Cisco Analog Telephone Adaptor (ATA) Softwareversion=1.1.0; version=1.1.1; version=11.1.0; version=11.1.0 MSR1; version=11.1.0 MSR2; version=11.1.0 MSR3; version=11.1.0 MSR4; version=1.1.2; version=11.2.1; version=12.0.1; version=12.0.1 SR1; version=12.0.1 SR2; version=12.0.1 SR3; version=12.0.1 SR4; version=1.2.1; version=1.2.2; version=1.2.2 SR1; version=1.2.2 SR2

Published CVSS scores

5.3Cisco Systems, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

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-125Out-of-bounds Read
CWE-1284Improper Validation of Specified Quantity in Input
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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