How severe is CVE-2025-34026?

No CVSS score has been assigned to CVE-2025-34026 yet. Review the advisory details and affected package list to assess your exposure.

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 release is recorded for CVE-2025-34026 yet. Track the upstream advisory, and apply the exposure-reduction steps below in the meantime.

How do I detect CVE-2025-34026 in my code and dependencies?

Identify every host running the affected component and compare the installed build against the fixed version below — for source-built or distro-packaged software the version string, not a lockfile, is the source of truth (`dpkg -l`, `rpm -q`, or the binary's own `--version`).

How do I mitigate CVE-2025-34026 if there is no patch (or I can't update yet)?

Put an independent control in front of the weakness: restrict the affected endpoint or interface to trusted networks, require an additional authentication factor or proxy-level check, and invalidate existing sessions and credentials in case the flaw has already been used.

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 81.8%, placing it in the 100th 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.

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.

CISA KEV · ACTIVELY EXPLOITED

CVE-2025-34026

CVE-2025-34026 is a CWE-288 vulnerability. It is in CISA's Known Exploited Vulnerabilities catalog (added 2026-01-22) — treat it as actively exploited and patch now. No vendor fix is recorded yet; mitigation options are listed below.

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…

Published

May 21, 2025

Updated

Jan 23, 2026

Affected

1 product

Patched

See advisory

Exploits

None indexed

Exploitation data as of Oct 23, 2026 · OSV.dev, NVD, CISA KEV, FIRST.org (EPSS)

Exploitation Status

Actively exploited in the wild

Confirmed by CISA's Known Exploited Vulnerabilities catalog on 2026-01-22. Federal agencies were required to remediate by 2026-02-12.
CISA assesses this as automatable — exploitation doesn’t require manual, per-target effort, which raises the odds of mass scanning and opportunistic attacks.

Exploitation and automatability from CISA (KEV catalog and SSVC triage) for CVE-2025-34026.

EPSS Exploitation Probability

via FIRST.org ↗

81.8%probability of exploitation in next 30 days

Very High Risk-0.16%

Lower risk than most CVEs100th percentile — riskier than 100% of all scored CVEsHighest risk

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

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

Detection & mitigation playbook

Vulnerability

Detect
Identify every host running the affected component and compare the installed build against the fixed version below — for source-built or distro-packaged software the version string, not a lockfile, is the source of truth (`dpkg -l`, `rpm -q`, or the binary's own `--version`).
Remediation status
No fixed release is recorded for CVE-2025-34026 yet. Track the upstream advisory, and apply the exposure-reduction steps below in the meantime.
Mitigate without a patch
Put an independent control in front of the weakness: restrict the affected endpoint or interface to trusted networks, require an additional authentication factor or proxy-level check, and invalidate existing sessions and credentials in case the flaw has already been used.

How to detect CVE-2025-34026

A community-maintained Nuclei template exists for this CVE. You can scan for it directly:

nuclei -id cve-2025-34026 -u https://target

Template: Versa Concerto Actuator Endpoint - Authentication Bypass
Severity: critical
Impact: Attackers can bypass authentication by omitting the X-Real-Ip header to access restricted Spring Boot Actuator endpoints, potentially exposing sensitive system information and functionality.
Remediation: Upgrade to the latest Versa Concerto version that properly validates authentication for all Actuator endpoints regardless of header presence.

Template by ProjectDiscovery nuclei-templates (iamnoooob, rootxharsh, parthmalhotra), MIT licensed. View the full template. Scan only systems you are authorised to test.

Frequently Asked Questions

O3 Security · Impact-Aware SCA

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