CVE-2025-34026: Versa Concerto Improper Authentication Vulnerability

Is it exploited?

Yes. CISA added it to the Known Exploited Vulnerabilities catalog on 22 Jan 2026, 246 days after the CVE record was published.

How likely is exploitation in the next 30 days?

81.8%

EPSS score, percentile 99.6 of all scored records

How severe?

9.2 Critical

CVSS v4.0 base score, given by the CNA

What should I do?

CISA deadline 12 Feb 2026. Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

Advisories and patches (1)

Which versions are affected?

Affected

• 12.1.2 through 12.2.0

Versions by product

Source: CISA Known Exploited Vulnerabilities (KEV) catalog, 2026.10.28, as of 28 Oct 2026; FIRST Exploit Prediction Scoring System (EPSS), v2026.06.15, as of 28 Oct 2026; CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026. About the data.

What to do

CISA due date for this action: 12 February 2026.

Advisories and patches

• projectdiscovery.io (Exploit, Mitigation)

Linked from CISA's catalog entry

• https://security-portal.versa-networks.com/emailbulletins/6830f94328defa375486ff2e
• https://nvd.nist.gov/vuln/detail/CVE-2025-34026

Affected products and versions

As listed in the CVE record.

Versions not listed are: unknown.

Source: CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026. About the data.

About this vulnerability

Versa Concerto SD-WAN orchestration platform contains an improper authentication vulnerability in the Traefik reverse proxy configuration, allowing at attacker to access administrative endpoints. The internal Actuator endpoint can be leveraged for access to heap dumps and trace logs.

Summary: CISA's KEV catalog, as of 28 Oct 2026.

• CISA added CVE-2025-34026 to its Known Exploited Vulnerabilities (KEV) catalog on 22 Jan 2026.
• CISA's ransomware flag for this entry is "Unknown": no evidence of ransomware use in the catalog, which is not proof of none.
• The due date CISA sets for the required action is 12 Feb 2026.
• The CVE record was published on 21 May 2025, 246 days before it was added to KEV.
• The CVE record carries a CVSS v4.0 base score of 9.2 (Critical), given by its CNA.
• FIRST's EPSS model puts the probability of exploitation in the next 30 days at 81.8% (percentile 99.6), as of 28 Oct 2026.
• CISA's SSVC assessment in the CVE record: exploitation active, automatable yes, technical impact partial.

Source: CISA Known Exploited Vulnerabilities (KEV) catalog, 2026.10.28, as of 28 Oct 2026; CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026; FIRST Exploit Prediction Scoring System (EPSS), v2026.06.15, as of 28 Oct 2026. About the data.

Description

Versa Concerto Actuator Authentication Bypass Information Leak

The Versa Concerto SD-WAN orchestration platform is vulnerable to an authentication bypass in the Traefik reverse proxy configuration, allowing at attacker to access administrative endpoints. The internal Actuator endpoint can be leveraged for access to heap dumps and trace logs.This issue is known to affect Concerto from 12.1.2 through 12.2.0. Additional versions may be vulnerable.

Source: CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026. About the data.

Weakness

• CWE-288: Authentication Bypass Using an Alternate Path or Channel

Attack patterns (CAPEC)

• CAPEC-131: Resource Leak Exposure

CWE and CAPEC are maintained by MITRE; the entries are those named in the CVE record and the KEV entry.

Timeline

More exploited Versa vulnerabilities

• CVE-2024-39717: Versa Director Dangerous File Type Upload Vulnerability (added 23 Aug 2024)