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CVE-2025-3028VulnerabilityPublished Updated

Red Hat Security Advisory: firefox security update

Affects Red Hat firefoxSource GCVE Database

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Mentioned vulnerabilities

Authoritative record:CVE-2025-3028· Medium 6.5

Not known to be exploited · CVSS 6.5 Medium.

Data as of 5 Nov 2026, 19:02 UTC

CVSS 3.1 base score
6.5Medium
How severe the flaw is on the 0–10 CVSS scale.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 1 Apr 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 5 Nov 2026.

What to do

AI-suggested

Red Hat has released updated Firefox packages for Red Hat Enterprise Linux 8.4 variants that address these vulnerabilities. Users should apply these official updates promptly to remediate the issues. Detailed update instructions are available at Red Hat's knowledge base article https://access.redhat.com/articles/11258. No additional mitigation steps are indicated beyond applying the official patches.

Description

Red Hat issued a security advisory for Firefox addressing multiple vulnerabilities including URL bar spoofing via non-BMP Unicode characters (CVE-2025-3029), a use-after-free triggered by XSLTProcessor (CVE-2025-3028), and various memory safety bugs (CVE-2025-3030). These issues affect Firefox and Thunderbird and have been fixed in Firefox 137, Thunderbird 137, Firefox ESR 128.9, and Thunderbird 128.9. The update is rated as Important by Red Hat and is available for Red Hat Enterprise Linux 8.4 variants.

References

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