CVE-2024-20420Network attack vector

Authenticated Admin command execution via incorrect HTTP authorization

Published Oct 16, 2024 · Updated Oct 31, 2024

Privilege escalation in Cisco ATA 190 Series firmware allows remote authenticated users with low privileges to run commands as Admin. The HTTP server incorrectly verifies authorization for malicious web-management requests, letting a low-privileged session invoke administrative commands. Reachability requires valid low-privilege credentials and an enabled management interface; successful exploitation grants Admin command execution without reported service interruption.

CVSS severity5.4
Medium
EPSS probability0.36%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Privilege escalation in Cisco ATA 190 Series firmware allows remote authenticated users with low privileges to run commands as Admin. The HTTP server incorrectly verifies authorization for malicious web-management requests, letting a low-privileged session invoke administrative commands. Reachability requires valid low-privilege credentials and an enabled management interface; successful exploitation grants Admin command execution without reported service interruption.

The record

CVE
CVE-2024-20420
Published
Oct 16, 2024
Updated
Oct 31, 2024
Vendor
ClamAV
Product
Cisco Analog Telephone Adaptor (ATA) Software
Classifications
CWE-250, CWE-863, T1068
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 16, 2024CVE publishedPublication date reported by the CVE source.
  2. Oct 31, 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=11.1.0
  2. Affected versionversion=11.1.0 MSR1
  3. Affected versionversion=11.1.0 MSR2
  4. Affected versionversion=11.1.0 MSR3
  5. Affected versionversion=11.1.0 MSR4
  6. Affected versionversion=11.2.1
  7. Affected versionversion=11.2.2
  8. Affected versionversion=11.2.2 MSR1
  9. Affected versionversion=11.2.3
  10. Affected versionversion=11.2.4
  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=12.0.1 SR5

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

ClamAV · Cisco Analog Telephone Adaptor (ATA) Softwareversion=11.1.0; version=11.1.0 MSR1; version=11.1.0 MSR2; version=11.1.0 MSR3; version=11.1.0 MSR4; version=11.2.1; version=11.2.2; version=11.2.2 MSR1; version=11.2.3; version=11.2.4; version=12.0.1 SR1; version=12.0.1 SR2; version=12.0.1 SR3; version=12.0.1 SR4; version=12.0.1 SR5

Published CVSS scores

8.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
5.4Cisco Systems, Inc.CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N

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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-250Execution with Unnecessary Privileges
CWE-863Incorrect Authorization
T1068Exploitation for Privilege Escalation

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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