CVE-2026-20034

Published May 6, 2026

Last updated 7 days ago

CVSS high 8.8
Tunneling protocol

Overview

Description
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.
Source
psirt@cisco.com
NVD status
Awaiting Analysis

Risk scores

CVSS 3.1

Type
Primary
Base score
8.8
Impact score
5.9
Exploitability score
2.8
Vector string
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Severity
HIGH

Weaknesses

psirt@cisco.com
CWE-35

Social media

Hype score
Not currently trending

Related CVEs

  1. Palo Alto Networks PAN-OS Out-of-bounds Write Vulnerability•CVE-2026-0300
  2. A vulnerability in the web UI of Cisco Unity Connection Web Inbox could allow an unauthenticated, remote attacker to conduct SSRF attacks through an affected device. This vulnerability is due to improper input validation for specific HTTP requests. An attacker could exploit this vulnerability by sending a crafted HTTP request to an affected device. A successful exploit could allow the attacker to send arbitrary network requests that are sourced from the affected device.•CVE-2026-20035
  3. Linux Kernel Incorrect Resource Transfer Between Spheres Vulnerability•CVE-2026-31431
  4. Insufficient granularity of access control in Microsoft Defender allows an authorized attacker to elevate privileges locally.•CVE-2026-33825
  5. Double free in Windows IKE Extension allows an unauthorized attacker to execute code over a network.•CVE-2026-33824

References

Sources include official advisories and independent security research.