How severe is CVE-2025-34026?

CVE-2025-34026 has a CVSS score of 7.5/10, rated HIGH. Immediate patching is strongly recommended.

Which packages are affected by CVE-2025-34026?

Affected package information for CVE-2025-34026 is not yet fully mapped. Check the official advisory links for details.

How do I fix CVE-2025-34026?

No fixed version has been published for CVE-2025-34026 yet. Monitor the advisory for updates, apply mitigations recommended by the vendor, and use O3 Security to track when a fix becomes available in your stack.

Is CVE-2025-34026 actively exploited in the wild?

No public exploit code has been indexed for CVE-2025-34026 yet. This does not mean the vulnerability cannot be exploited — absence of public exploits does not imply safety. Apply the recommended fix and use O3 Security to monitor your exposure.

What is the EPSS score for CVE-2025-34026?

CVE-2025-34026 has an EPSS (Exploit Prediction Scoring System) score of 71.1%, placing it in the 99th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. A score above 50% indicates significantly elevated exploitation risk — immediate patching is strongly recommended.

Is CVE-2025-34026 in the CISA Known Exploited Vulnerabilities catalog?

Yes. CVE-2025-34026 (Versa Concerto Improper Authentication Vulnerability) was added to CISA's Known Exploited Vulnerabilities (KEV) catalog on 2026-01-22. CISA required all US federal civilian agencies to remediate this vulnerability by 2026-02-12. The required action was: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. Being listed in the KEV catalog is the strongest possible confirmation of active exploitation — treat this as a critical priority.

What type of vulnerability is CVE-2025-34026?

CVE-2025-34026 is classified as CWE-288 (CWE-288). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation.

Which products and versions are affected by CVE-2025-34026?

CVE-2025-34026 affects versa-networks concerto (2 versions, e.g. 12.1.2, 12.2.0). Check the affected-products list on this page against your deployed version to confirm exposure.

Is there exploit tooling available for CVE-2025-34026?

A Nuclei detection template exists for CVE-2025-34026, meaning automated scanners can fingerprint it. Public exploit tooling significantly increases real-world risk — prioritize patching and ensure detection coverage. Exploit tooling should only ever be used in isolated, authorized testing environments.

When was CVE-2025-34026 published, and has it been updated?

CVE-2025-34026 was published on May 21, 2025 and was last updated on January 23, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

CVE-2025-34026: Concerto CWE-288 (High 7.5)

EPSS Exploitation Probability

via FIRST.org ↗

71.1%probability of exploitation in next 30 days

Very High Risk99th percentile0.00%

EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.

Description

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.

Affected Products

1 product · 3 configurations

Application

concertoversa-networks

≥ 11.4.0 && < 12.1.2

2 versions

12.1.212.2.0

Frequently Asked Questions

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.

O3 Security · Impact-Aware SCA

Is CVE-2025-34026 in your stack?

O3 detects CVE-2025-34026 across dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.

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