CVE-2025-34026
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.
do firstApply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Can a WAF block it? Partly. Cloudflare publishes WAF a rule written for this CVE. Such rules block the known exploit requests and buy time, but attackers can change the request to get past them, so they do not replace the patch.
Cloudflare · 1 rule (Block) · since 2 Jun 2025
- Versa Concerto SD-WAN - Auth Bypass - CVE:CVE-2025-34026 · Cloudflare Managed Ruleset
Also consider: patch · enable the vendor rule in block mode
Based on WAF vendor rules published for this CVE. We check Cloudflare, AWS, Google Cloud Armor and Azure; for Akamai, Imperva, Fastly, F5, ask your vendor.
Is CVE-2025-34026 being exploited?
Yes. CVE-2025-34026 appears in CISA's Known Exploited Vulnerabilities catalog, which means exploitation in the wild has been confirmed and reported. Treat it as active rather than theoretical, and patch it ahead of higher-scoring vulnerabilities that carry no exploitation evidence.
How severe is CVE-2025-34026?
CVE-2025-34026 is rated High with a CVSS score of 7.5. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2025-34026?
Yes. A fix has been recorded for CVE-2025-34026. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2025-34026 affect?
CVE-2025-34026 affects versa-networks:concerto. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
- affected>= 12.1.2 and <= 12.2.0
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.
public exploits
Detection templates only, no public exploit found: 1 Nuclei template
- Versa Concerto Actuator Endpoint - Authentication Bypass · detection template · critical
Listed so you can judge urgency, not as a recommendation to run anything. GitHub “proofs of concept” are unvetted: some are fake or carry malware. Exploit-DB marks the entries its staff verified.
cisa ssvc
- exploitation
- active
- automatable
- yes
- technical impact
- partial
Assessed by CISA 23 Jan 2026 (SSVC 2.0.3).
timeline
- 21 May 2025Published
- 22 Jan 2026Added to CISA KEV (exploited in the wild) · 245 days (about 8 months) later
- 23 Jan 2026CISA SSVC assessment: exploitation active · 2 days later
- 23 Jan 2026CVE record last updated · same day later
- 12 Feb 2026CISA remediation due date (US federal agencies) · 19 days later
- 2 Nov 2026Analysed by vulneraibility.com · 264 days (about 9 months) later
- Advisorysecurity-portal.versa-networks.com /emailbulletins/6830f94328defa375486ff2e
- Exploitprojectdiscovery.io /blog/versa-concerto-authentication-bypass-rce
- Linkcisa.gov /known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-34026
sources
- CVE List (CVE.org): description, affected versions, references; CVE Terms of Use
- NVD: CVSS and CPE data
- CISA KEV catalog: exploitation, date added, due date
- CISA Vulnrichment (ADP): SSVC decision points
- FIRST EPSS: exploit probability and percentile
- Nuclei templates: detection templates
- Summary, impact and triage tags: written by our AI analysis pipeline from the sources above. Check them against the sources.