How severe is CVE-2026-20035?

CVE-2026-20035 has a CVSS 3.x base score of 7.2, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2026-20035 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (23rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-20035?

CVE-2026-20035 primarily affects Cisco Unity Connection. In total, 10 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2026-20035?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-20035 have an EU (EUVD) identifier?

Yes. CVE-2026-20035 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-27848.

When was CVE-2026-20035 published?

CVE-2026-20035 was published on 2026-05-06 and last updated on 2026-07-08.

CVE-2026-20035

CVE-2026-20035 is a high-severity vulnerability in Cisco Unity Connection with a CVSS 3.x base score of 7.2. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-918.

Key facts

Severity: High (CVSS 3.x base score 7.2)
EPSS exploit prediction: 0% (23rd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-27848
Weakness: CWE-918
Affected product: Cisco Unity Connection
Published: 2026-05-06
Last modified: 2026-07-08

Description

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.

Frequently asked questions

What is CVE-2026-20035?: 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.
How severe is CVE-2026-20035?: CVE-2026-20035 has a CVSS 3.x base score of 7.2, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2026-20035 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (23rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-20035?: CVE-2026-20035 primarily affects Cisco Unity Connection. In total, 10 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2026-20035?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-20035 have an EU (EUVD) identifier?: Yes. CVE-2026-20035 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-27848.
When was CVE-2026-20035 published?: CVE-2026-20035 was published on 2026-05-06 and last updated on 2026-07-08.

References

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-unity-rce-ssrf-hENhuASy

Affected products (10)

cpe:2.3:a:cisco:unity_connection:*:*:*:*:*:*:*:*
cpe:2.3:a:cisco:unity_connection:14.0:*:*:*:*:*:*:*
cpe:2.3:a:cisco:unity_connection:14su1:*:*:*:*:*:*:*
cpe:2.3:a:cisco:unity_connection:14su2:*:*:*:*:*:*:*
cpe:2.3:a:cisco:unity_connection:14su3:*:*:*:*:*:*:*
cpe:2.3:a:cisco:unity_connection:14su4:*:*:*:*:*:*:*
cpe:2.3:a:cisco:unity_connection:15.0:*:*:*:*:*:*:*
cpe:2.3:a:cisco:unity_connection:15su1:*:*:*:*:*:*:*
cpe:2.3:a:cisco:unity_connection:15su2:*:*:*:*:*:*:*
cpe:2.3:a:cisco:unity_connection:15su3:*:*:*:*:*:*:*

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