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VulnerabilityPublished Updated

CVE-2025-1017: Memory Safety Bugs Present

Source GCVE Database

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Authoritative record:CVE-2025-1017· Critical 9.8

Not known to be exploited · CVSS 9.8 Critical · fixed in 135 : patch affected systems as a priority.

Data as of 30 Oct 2026, 01:09 UTC

CVSS 3.1 base score
9.8Critical
How severe the flaw is on the 0–10 CVSS scale.
Patch
Available – fixed in 135, 128.7
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 4 Feb 2025

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: 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 29 Oct 2026.

What to do

AI-suggested

These vulnerabilities have been fixed in Firefox 135, Thunderbird 135, Firefox ESR 128.7, and Thunderbird 128.7. Users and administrators should update to these fixed versions or later to mitigate the risk. No additional mitigation steps are required beyond applying the official updates.

Description

Multiple memory safety vulnerabilities were identified in Firefox 134, Thunderbird 134, Firefox ESR 128.6, and Thunderbird 128.6. These bugs include use-after-free and other memory corruption issues that could potentially allow an attacker to execute arbitrary code. The vulnerabilities were addressed and fixed in Firefox 135, Thunderbird 135, Firefox ESR 128.7, and Thunderbird 128.7. The CVSS score for these vulnerabilities is 9.8, indicating critical severity.

References

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