CVE-2025-11708Network attack vector

Freed-memory access via stale instance lookup

Published Oct 14, 2025 · Updated Oct 14, 2025

Use-after-free in affected Mozilla Firefox and Thunderbird releases allows remote attackers to access freed process memory. MediaTrackGraphImpl::GetInstance() accesses an object after its lifetime ends, but Mozilla has not disclosed the invalid lifetime transition or triggering input. Reachability is unauthenticated, and Thunderbird exposure is limited to browser or browser-like contexts because scripting is disabled while reading email; no more specific outcome is public.

CVSS severity9.8
Critical
EPSS probability0.51%
Next 30 days · Sep 17, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in affected Mozilla Firefox and Thunderbird releases allows remote attackers to access freed process memory. MediaTrackGraphImpl::GetInstance() accesses an object after its lifetime ends, but Mozilla has not disclosed the invalid lifetime transition or triggering input. Reachability is unauthenticated, and Thunderbird exposure is limited to browser or browser-like contexts because scripting is disabled while reading email; no more specific outcome is public.

The record

CVE
CVE-2025-11708
Published
Oct 14, 2025
Updated
Oct 14, 2025
Vendor
Mozilla
Product
Firefox
Classifications
CWE-416
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 14, 2025CVE publishedPublication date reported by the CVE source.
  2. Oct 14, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=unspecified <144

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Mozilla · Firefoxversion=unspecified <144
Mozilla · Thunderbirdversion=unspecified <140.4; version=unspecified <144
Mozilla · Firefox ESRversion=unspecified <140.4

Published CVSS scores

9.8CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-416Use After Free

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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