Cyber Resilience

CVE-2026-20034

High

Published: 06 May 2026

Published
06 May 2026
Modified
06 May 2026
KEV Added
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Patch
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CVSS Score v3.1 8.8 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS Score 0.0070 48.4th percentile
Risk Priority 55 floored blend · peak EPSS

Summary

CVE-2026-20034 is a high-severity Path Traversal: '.../...//' (CWE-35) vulnerability in Cisco Unity Connection (inferred from references). Its CVSS base score is 8.8 (High).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 48.4th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

EU & UK References

Vulnerability details

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…

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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.

CWE(s)
CWE-35

Related Threats

MITRE ATT&CK Enterprise TechniquesAI

T1190 Exploit Public-Facing Application Initial Access
Adversaries may attempt to exploit a weakness in an Internet-facing host or system to initially access a network.
attack.mitre.org →
T1068 Exploitation for Privilege Escalation Privilege Escalation
Adversaries may exploit software vulnerabilities in an attempt to elevate privileges.
attack.mitre.org →
Why these techniques?

Authenticated RCE via crafted API request to web management interface enables T1190 (public-facing app exploitation) and T1068 (priv esc to root).

Confidence: HIGH · MITRE ATT&CK Enterprise v19.0

CVEs Like This One

CVE-2026-25397Shared CWE-35
CVE-2025-59099Shared CWE-35
CVE-2025-26356Shared CWE-35
CVE-2026-42930Shared CWE-35
CVE-2026-25705Shared CWE-35
CVE-2024-54362Shared CWE-35
CVE-2026-7302Shared CWE-35
CVE-2025-26354Shared CWE-35
CVE-2025-67914Shared CWE-35
CVE-2025-59793Shared CWE-35

Affected Assets

Cisco
Unity Connection
inferred from references and description; NVD did not file a CPE for this CVE

Mitigating Controls

No mitigating controls mapped yet. The per-CVE control annotator has not reached this CVE.

References