{"id":"CVE-2025-34026","published":"2025-05-21T22:15:50Z","modified":"2026-06-17T09:13:19Z","title":"Versa Concerto Improper Authentication Vulnerability","vendor":"Versa","product":"Concerto","tier":"core","eol":null,"description":{"text":"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.","provenance":"source","from":"NVD"},"summary":{"text":"The Versa Concerto SD-WAN orchestration platform contains an authentication bypass in the configuration of its Traefik reverse proxy, which exposes internal Actuator endpoints that can be used to reach administrative functionality, heap dumps and trace logs. An attacker with network access to the platform can exploit this without credentials or user interaction, with the flaw affecting Concerto from 12.1.2 through 12.2.0 and possibly other versions.","provenance":"ai","model":"claude-haiku-5-5","generatedAt":"2026-10-23T07:10:59Z"},"cvss":{"score":7.5,"severity":"HIGH","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","provenance":"source","from":"NVD"},"epss":{"score":0.8178,"percentile":0.99644,"date":"2026-10-29","provenance":"source"},"kev":{"dateAdded":"2026-01-22","dueDate":"2026-02-12","ransomware":false,"requiredAction":"Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.","notes":"https://security-portal.versa-networks.com/emailbulletins/6830f94328defa375486ff2e ; https://nvd.nist.gov/vuln/detail/CVE-2025-34026","provenance":"source"},"vulncheckKev":{"dateAdded":"2025-06-07","exploitedFirstSeen":"2025-06-07","ransomware":false,"evidence":[{"url":"https://app.crowdsec.net/cti/cve-explorer/CVE-2025-34026","date":"2025-06-07"},{"url":"https://cyble.com/blog/week-in-vulnerabilities-ivanti-flagged-by-cyble/","date":"2025-06-13"},{"url":"https://dashboard.shadowserver.org/statistics/honeypot/vulnerability/map/?day=2025-07-21&host_type=src&vulnerability=cve-2025-34026","date":"2025-07-21"},{"url":"https://dashboard.shadowserver.org/statistics/honeypot/vulnerability/map/?day=2025-07-23&host_type=src&vulnerability=cve-2025-34026","date":"2025-07-23"},{"url":"https://dashboard.shadowserver.org/statistics/honeypot/vulnerability/map/?day=2025-07-24&host_type=src&vulnerability=cve-2025-34026","date":"2025-07-24"},{"url":"https://dashboard.shadowserver.org/statistics/honeypot/vulnerability/map/?day=2025-07-25&host_type=src&vulnerability=cve-2025-34026","date":"2025-07-25"},{"url":"https://dashboard.shadowserver.org/statistics/honeypot/vulnerability/map/?day=2025-07-26&host_type=src&vulnerability=cve-2025-34026","date":"2025-07-26"},{"url":"https://dashboard.shadowserver.org/statistics/honeypot/vulnerability/map/?day=2025-07-27&host_type=src&vulnerability=cve-2025-34026","date":"2025-07-27"},{"url":"https://dashboard.shadowserver.org/statistics/honeypot/vulnerability/map/?day=2025-07-28&host_type=src&vulnerability=cve-2025-34026","date":"2025-07-28"},{"url":"https://dashboard.shadowserver.org/statistics/honeypot/vulnerability/map/?day=2025-07-29&host_type=src&vulnerability=cve-2025-34026","date":"2025-07-29"}],"evidenceTotal":201,"provenance":"source"},"exploited":true,"otx":{"pulseCount":50,"pulses":[{"name":"Actively_Exploited_Kev | Oct 30, 2026","url":"https://otx.alienvault.com/pulse/6ae35d889ea92b4ce19c2680","created":"2026-10-29"},{"name":"Actively_Exploited_Kev | Oct 29, 2026","url":"https://otx.alienvault.com/pulse/6ae20c1db17e7057ae7d9ad1","created":"2026-10-28"},{"name":"Actively_Exploited_Kev | Oct 28, 2026","url":"https://otx.alienvault.com/pulse/6ae0ba7e0e2a97ff7b218819","created":"2026-10-27"},{"name":"Actively_Exploited_Kev | Oct 27, 2026","url":"https://otx.alienvault.com/pulse/6adf68b85c3e852f3c111d18","created":"2026-10-26"},{"name":"Actively_Exploited_Kev | Oct 24, 2026","url":"https://otx.alienvault.com/pulse/6adb740e397c3ad4799aa4cd","created":"2026-10-23"},{"name":"Actively_Exploited_Kev | Oct 23, 2026","url":"https://otx.alienvault.com/pulse/6ada236fcfba2dfa730ea482","created":"2026-10-22"},{"name":"Actively_Exploited_Kev | Oct 22, 2026","url":"https://otx.alienvault.com/pulse/6ad8d33a077cbb5cab524d80","created":"2026-10-21"},{"name":"Actively_Exploited_Kev | Oct 21, 2026","url":"https://otx.alienvault.com/pulse/6ad78130c4d1ac2be83a8b6d","created":"2026-10-20"},{"name":"Actively_Exploited_Kev | Oct 20, 2026","url":"https://otx.alienvault.com/pulse/6ad62f63c24a405a3423cc13","created":"2026-10-19"},{"name":"Actively_Exploited_Kev | Oct 19, 2026","url":"https://otx.alienvault.com/pulse/6ad4dda174e5797d0bd238b7","created":"2026-10-18"}],"provenance":"machine"},"cwes":[{"id":"CWE-288","name":"Authentication Bypass Using an Alternate Path or Channel"}],"references":[{"url":"https://projectdiscovery.io/blog/versa-concerto-authentication-bypass-rce","tags":["Exploit","Mitigation","Third Party Advisory"]},{"url":"https://projectdiscovery.io/blog/versa-concerto-authentication-bypass-rce","tags":["Exploit","Mitigation","Third Party Advisory"]},{"url":"https://security-portal.versa-networks.com/emailbulletins/6830f94328defa375486ff2e","tags":["Vendor Advisory"]},{"url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-34026","tags":["US Government Resource"]}],"techniques":[{"id":"T1190","name":"Exploit Public-Facing Application","tactics":["initial-access"],"provenance":"ai","basis":"ai-mapping","bases":["ai-mapping"],"basisDetail":"claude-haiku-5-5: Public-facing app exploited via Traefik proxy bypass","mappingType":"exploitation_technique","evidence":[{"from":"description","quote":"allowing at attacker to access administrative endpoints","start":135,"end":190}],"model":"claude-haiku-5-5","confidence":"medium","confidenceNote":"AI-mapped from the description (quote-validated, not expert-reviewed)"},{"id":"T1005","name":"Data from Local System","tactics":["collection"],"provenance":"ai","basis":"ai-mapping","bases":["ai-mapping"],"basisDetail":"claude-haiku-5-5: Heap dumps and trace logs read from server","mappingType":"primary_impact","evidence":[{"from":"description","quote":"can be leveraged for access to heap dumps and trace logs","start":223,"end":279}],"model":"claude-haiku-5-5","confidence":"medium","confidenceNote":"AI-mapped from the description (quote-validated, not expert-reviewed)"},{"id":"T1078","name":"Valid Accounts","tactics":["initial-access","persistence","privilege-escalation","stealth"],"provenance":"ai","basis":"ai-mapping","bases":["ai-mapping"],"basisDetail":"claude-haiku-5-5: Bypass grants administrative endpoint access","mappingType":"primary_impact","evidence":[{"from":"description","quote":"allowing at attacker to access administrative endpoints","start":135,"end":190}],"model":"claude-haiku-5-5","confidence":"medium","confidenceNote":"AI-mapped from the description (quote-validated, not expert-reviewed)"}],"reports":[],"affected":[],"advisories":[],"euvd":{"id":"EUVD-2025-16087","url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2025-16087","exploited":true,"exploitedSince":"2026-01-22","provenance":"source"},"exploits":[],"exploitSources":{"nuclei":[{"id":"CVE-2025-34026","name":"Versa Concerto Actuator Endpoint - Authentication Bypass","severity":"critical","path":"http/cves/2025/CVE-2025-34026.yaml","url":"https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2025/CVE-2025-34026.yaml"}],"provenance":"source"},"exploitRefs":["https://projectdiscovery.io/blog/versa-concerto-authentication-bypass-rce"],"flow":[{"stage":"exploitation","techniques":["T1190"],"provenance":"ai"},{"stage":"primary","techniques":["T1078","T1005"],"provenance":"ai"}],"timeline":[{"date":"2025-05-21","kind":"published","label":"Published (NVD)","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-34026","provenance":"source"},{"date":"2025-06-07","kind":"exploited-reported","label":"Exploitation first reported (VulnCheck KEV evidence)","url":"https://app.crowdsec.net/cti/cve-explorer/CVE-2025-34026","provenance":"source"},{"date":"2026-01-22","kind":"kev","label":"Added to CISA KEV","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","provenance":"source"},{"date":"2026-01-22","kind":"euvd-exploited","label":"ENISA EUVD: exploited","url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2025-16087","provenance":"source"}],"speed":{"daysToPublicExploit":null,"firstExploitFrom":null,"daysToKev":246},"priority":{"score":68.2,"factors":[{"name":"In a KEV catalog","points":35.0,"detail":"listed in CISA KEV and VulnCheck KEV"},{"name":"Recent KEV listing","points":0.0,"detail":"added 510 days ago"},{"name":"Known ransomware use","points":0.0,"detail":"not known"},{"name":"EPSS percentile","points":19.93,"detail":"percentile 0.9964"},{"name":"Named in threat reports","points":0.0,"detail":"0 reports"},{"name":"Public exploit code","points":5.0,"detail":"1 NVD reference tagged Exploit; 1 nuclei template"},{"name":"Mentioned in OTX pulses","points":3.0,"detail":"50 pulses"},{"name":"CVSS severity","points":5.25,"detail":"base score 7.5"},{"name":"End-of-life product","points":0.0,"detail":"supported or unknown"}]}}