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CVE-2025-41064VulnerabilityPublished

CVE-2025-41064: GTT OpenSIAC · Improper Authentication

Affects GTT OpenSIACSource CVE Database V5

0

Not known to be exploited · CVSS 9.3 Critical.

Data as of 26 Oct 2026, 06:26 UTC

CVSS 4.0 base score
9.3Critical
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.3% chance of exploitation in 30 days – higher than 28% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 2 Oct 2025

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponised: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 2026-10-26.

What to do

Affected software

ProductAffectedFixed in
GTT OpenSIACAffected
  • =1.0
Fixed in–

AI-suggested

Organizations should prioritize patching OpenSIAC to a fixed version once GTT releases an update addressing CVE-2025-41064. Until patches are available, restrict network access to OpenSIAC services using firewalls and network segmentation to limit exposure to trusted IP ranges. Implement additional layers of authentication beyond Cl@ve, such as multi-factor authentication (MFA), to reduce the risk of impersonation. Conduct thorough audits of authentication logs to detect anomalous access patterns indicative of exploitation attempts. Educate users and administrators about the vulnerability and encourage vigilance for suspicious activity. Collaborate with national cybersecurity agencies like INCIBE for guidance and threat intelligence sharing. Review and strengthen identity verification workflows to include out-of-band verification methods where feasible. Finally, prepare incident response plans specifically addressing potential identity impersonation scenarios to enable rapid containment and remediation.

Description

CVE-2025-41064 is a critical improper authentication vulnerability in GTT's OpenSIAC version 1.0 that allows attackers to impersonate users authenticated via the Cl@ve system. The flaw requires no authentication or user interaction and can be exploited remotely over the network, potentially compromising confidentiality, integrity, and availability of affected systems. Although no known exploits are currently in the wild, the high CVSS score of 9.3 underscores the severity of this issue. European organizations using OpenSIAC with Cl@ve authentication are at significant risk of unauthorized access and identity impersonation. Immediate mitigation steps include applying vendor patches once available, restricting network access to OpenSIAC services, and implementing additional multi-factor authentication layers. Countries with high adoption of Cl@ve and OpenSIAC, such as Spain and other EU members with integrated e-government services, are most likely to be affected. This vulnerability demands urgent attention to prevent potential large-scale identity-based attacks within European public and private sectors.

References

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