CVE-2025-11715Network attack vector

Arbitrary code execution via memory corruption

Published Oct 14, 2025 · Updated Oct 14, 2025

Memory corruption in Firefox and Thunderbird before 144 and their ESR branches before 140.4 allows remote attackers to execute arbitrary code. The rollup covers seven memory-safety bugs, but Mozilla's public advisory and restricted Bugzilla list do not disclose the affected code loci or invalid memory operations. Exploitation requires user interaction with attacker-controlled browser or browser-like content; disabled scripting while reading Thunderbird mail limits ordinary email exposure.

CVSS severity8.8
High
EPSS probability0.33%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Memory corruption in Firefox and Thunderbird before 144 and their ESR branches before 140.4 allows remote attackers to execute arbitrary code. The rollup covers seven memory-safety bugs, but Mozilla's public advisory and restricted Bugzilla list do not disclose the affected code loci or invalid memory operations. Exploitation requires user interaction with attacker-controlled browser or browser-like content; disabled scripting while reading Thunderbird mail limits ordinary email exposure.

The record

CVE
CVE-2025-11715
Published
Oct 14, 2025
Updated
Oct 14, 2025
Vendor
Mozilla
Product
Firefox
Classifications
CWE-119, T1203
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

8.8CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:R/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-119Improper Restriction of Operations within the Bounds of a Memory Buffer
T1203Exploitation for Client Execution

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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