CVE-2022-20686

Code execution and LLDP restart via malformed lengths

Published Dec 7, 2022 · Updated Aug 3, 2024

Improper LLDP length handling in Cisco ATA 190 Series firmware allows remote attackers to execute code or restart the LLDP service. The LLDP parser processes packet header length fields without validating them against the associated data. Exploitation requires access to the same Layer 2 broadcast domain and can execute code on the device or interrupt LLDP through an unexpected restart.

CVSS severity5.3
Medium
EPSS probability0.93%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper LLDP length handling in Cisco ATA 190 Series firmware allows remote attackers to execute code or restart the LLDP service. The LLDP parser processes packet header length fields without validating them against the associated data. Exploitation requires access to the same Layer 2 broadcast domain and can execute code on the device or interrupt LLDP through an unexpected restart.

The record

CVE
CVE-2022-20686
Published
Dec 7, 2022
Updated
Aug 3, 2024
Vendor
ClamAV
Product
Cisco Analog Telephone Adaptor (ATA) Software
Classifications
CWE-130, T1210
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

5.3CiscoCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
5.3NISTCVSS: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 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-130Improper Handling of Length Parameter Inconsistency
T1210Exploitation of Remote Services

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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