Cisco Unity Connection Remote Code Execution and Server-Side Request Forgery Vulnerabilities
Multiple vulnerabilities in Cisco Unity Connection could allow a remote attacker to execute arbitrary code on or conduct server-side request forgery (SSRF) attacks through an affected device. For more information about these vulnerabilities, see the Details section of this advisory. Cisco has released software updates that address these vulnerabilities. There are no workarounds that address these vulnerabilities. This advisory is available at the following link: https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-unity-rce-ssrf-hENhuASy Security Impact Rating: High CVE: CVE-2026-20034,CVE-2026-20035
CSIRTS triage
- What
- Multiple vulnerabilities could allow a remote attacker to execute arbitrary code or conduct server-side request forgery attacks.
- Who is affected
- Users of Cisco Unity Connection are affected.
- Urgency
- Remediation is urgent due to the high risk of remote code execution and SSRF attacks.
- Action
- Update to the latest version of Cisco Unity Connection.
AI-assisted analysis generated from the source advisory — verify against the original.
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Details
Exploitation outlook
EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.
- Low exploitation riskCVE-2026-200340.71% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 49% of all scored CVEs.
- Low exploitation riskCVE-2026-200350.30% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 22% of all scored CVEs.
Referenced CVEs
| CVE | CSIRTS overview | External |
|---|---|---|
| CVE-2026-20034 | coverage & exploitation status | NVD · CVE.org |
| CVE-2026-20035 | coverage & exploitation status | NVD · CVE.org |
Recent advisories for Cisco Unity Connection
A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.
- mediumCisco Unity Connection Cross-Site Scripting, Open Redirect, and SQL Injection Vulnerabilitiescisco-psirt · 2026-04-15
- mediumCisco Unity Connection Arbitrary File Download Vulnerabilitiescisco-psirt · 2026-04-15
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