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CVE-2025-3875VulnerabilityPublished Updated

Red Hat Security Advisory: thunderbird security update

Affects Red HatSource GCVE Database

0

Mentioned vulnerabilities

Not known to be exploited.

Data as of 25 Oct 2026, 19:02 UTC

Severity
High

Rated by Threat Radar · No CVSS score from NVD or the CNA

EPSS
0.3% chance of exploitation in 30 days – higher than 33% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 29 May 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 2026-10-25.

What to do

Affected software

ProductAffectedFixed in
Red Hatredhat/thunderbirdpkg:rpm/redhat/thunderbirdOther threatsAffected
  • =9.4
Fixed in–

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

Red Hat has released updated Thunderbird packages for Red Hat Enterprise Linux 9.4 Extended Update Support that address these vulnerabilities. Users should apply the security update as detailed in the Red Hat advisory (RHSA-2025:8325) available at https://access.redhat.com/articles/11258. No additional mitigation actions are specified by the vendor.

Description

Multiple security vulnerabilities have been identified in Mozilla Thunderbird as packaged for Red Hat Enterprise Linux 9.4 Extended Update Support. These include JavaScript execution via spoofed PDF attachments and file:/// links, sender spoofing through malformed From headers, unsolicited file downloads causing disk space exhaustion and credential leakage via mailbox:/// links, and tracking links in attachments bypassing remote content blocking. Red Hat has released an important security update addressing these issues for Thunderbird on RHEL 9.4.

References

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