CVE-2025-34026Known exploitationPublic exploitNetwork attack vector

Sensitive data disclosure via dropped X-Real-Ip header

Published May 21, 2025 · Updated Jan 23, 2026

Authentication bypass in Versa Networks Concerto 12.1.2 through 12.2.0 allows remote attackers to read Actuator heap dumps and trace logs. Traefik treats X-Real-Ip as a hop-by-hop Connection token and removes the proxy-added header, causing the backend to skip its external-request block. No credentials or user interaction are required; exposed diagnostics can reveal plaintext credentials and active session tokens.

CVSS severity9.2
Critical
EPSS probability81.94%
Next 30 days · Sep 16, 2026
Known exploitationReported
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication bypass in Versa Networks Concerto 12.1.2 through 12.2.0 allows remote attackers to read Actuator heap dumps and trace logs. Traefik treats X-Real-Ip as a hop-by-hop Connection token and removes the proxy-added header, causing the backend to skip its external-request block. No credentials or user interaction are required; exposed diagnostics can reveal plaintext credentials and active session tokens.

The record

CVE
CVE-2025-34026
Published
May 21, 2025
Updated
Jan 23, 2026
Vendor
Versa Networks
Product
Versa Concerto
Classifications
CWE-288, CAPEC-131, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 21, 2025CVE publishedPublication date reported by the CVE source.
  2. Jan 23, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=12.1.2 <=12.2.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Versa Networks · Versa Concertoversion=12.1.2 <=12.2.0

Published CVSS scores

7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
9.2VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:H/SI:L/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsShadowserver observations through Sep 15, 2026. Gaps indicate unavailable data.
Sep 9, 2026Sep 15, 2026
View daily counts
Reporting dayUnique IPs
Sep 9, 2026Unavailable
Sep 10, 2026Unavailable
Sep 11, 2026Unavailable
Sep 12, 2026Unavailable
Sep 13, 2026Unavailable
Sep 14, 20261
Sep 15, 2026Unavailable
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationReported
Public exploitPublished

Weakness, pattern, technique

CWE-288Authentication Bypass Using an Alternate Path or Channel
CAPEC-131Resource Leak Exposure
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Reported exploitation

Technologies

Your stack

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Your stack

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