How severe is CVE-2025-49177?

CVE-2025-49177 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability low.

Is CVE-2025-49177 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (29th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2025-49177?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2025-49177 have an EU (EUVD) identifier?

Yes. CVE-2025-49177 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-18499.

When was CVE-2025-49177 published?

CVE-2025-49177 was published on 2025-06-17 and last updated on 2026-06-30.

CVE-2025-49177

CVE-2025-49177 is a medium-severity vulnerability with a CVSS 3.x base score of 6.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-200.

Key facts

Severity: Medium (CVSS 3.x base score 6.1)
EPSS exploit prediction: 0% (29th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-18499
Weakness: CWE-200
Published: 2025-06-17
Last modified: 2026-06-30

Description

A flaw was found in the XFIXES extension. The XFixesSetClientDisconnectMode handler does not validate the request length, allowing a client to read unintended memory from previous requests.

Frequently asked questions

What is CVE-2025-49177?: A flaw was found in the XFIXES extension. The XFixesSetClientDisconnectMode handler does not validate the request length, allowing a client to read unintended memory from previous requests.
How severe is CVE-2025-49177?: CVE-2025-49177 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability low.
Is CVE-2025-49177 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (29th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2025-49177?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2025-49177 have an EU (EUVD) identifier?: Yes. CVE-2025-49177 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-18499.
When was CVE-2025-49177 published?: CVE-2025-49177 was published on 2025-06-17 and last updated on 2026-06-30.

References

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