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Vulnerabilities

Vulnerability · CVE-2026-20034

A vulnerability in the web-based management interface of Cisco Unity Connection could allow an authenticated, remote attacker to execute arbitrary code on an affected device.

Published May 6, 2026 · catalog updated Jul 1, 2026 · unity connection

Check if you run it

No confirmed exploitation is on record for CVE-2026-20034. EPSS is 0.71%. Act only if a listed version of unity connection is installed.

Gaps on this record

  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
High8.8
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.71%
Remediation
Advisory link
Affected products
cpe cisco/unity connection

A vulnerability in the web-based management interface of Cisco Unity Connection could allow an authenticated, remote attacker to execute arbitrary code on an affected device. This vulnerability is due to insufficient validation of user-supplied input. An attacker could exploit this vulnerability by submitting a crafted API request. A successful exploit could allow the attacker to execute arbitrary code as root, possibly resulting in the complete compromise of a targeted device. To exploit this vulnerability, the attacker must have valid user credentials on the affected device.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe cisco/unity connection14.0
  • cpe cisco/unity connection14su1
  • cpe cisco/unity connection14su2
  • cpe cisco/unity connection14su3
  • cpe cisco/unity connection14su4
  • cpe cisco/unity connection15.0
  • cpe cisco/unity connection15su1

How to fix CVE-2026-20034

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-20034. EPSS is 0.71%. Act only if a listed version of unity connection is installed.

Which versions are affected?

Compare what you have installed with cisco/unity connection 14.0; cisco/unity connection 14su1; cisco/unity connection 14su2; cisco/unity connection 14su3. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-35. EPSS 0.71%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

Cisco security

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. May 6, 2026 · NIST NVD

    Detected

    A vulnerability in the web-based management interface of Cisco Unity Connection could allow an authenticated, remote attacker to execute arbitrary code on an affected device. This vulnerability is due to insufficient validation of user-supplied input. An attacker could exploit this vulnerability by submitting a crafted API request. A successful exploit could allow the attacker to execute arbitrary

  2. Jul 1, 2026 · NIST NVD

    Updated

    A vulnerability in the web-based management interface of Cisco Unity Connection could allow an authenticated, remote attacker to execute arbitrary code on an affected device. This vulnerability is due to insufficient validation of user-supplied input. An attacker could exploit this vulnerability by submitting a crafted API request. A successful exploit could allow the attacker to execute arbitrary

Sources

  • CVE.orgVulnerability recordCVE-2026-20034

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-20034

    30-day exploitation probability 0.7%

    first.org
  • NIST NVDVulnerability recordCVE-2026-20034

    A vulnerability in the web-based management interface of Cisco Unity Connection could allow an authenticated, remote attacker to execute arbitrary code on an affected device. This vulnerability is due to insufficient validation of user-supplied input. An attacker could exploit

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.