CVE-2024-11704Network attack vector

Memory corruption via PKCS#7 key double free

Published Nov 26, 2024 · Updated Nov 3, 2025

Double-free in Mozilla Firefox before 133, Firefox ESR before 128.7, and Thunderbird before 133 allows attackers to corrupt memory. In sec_pkcs7_decoder_start_decrypt(), failure to create a PKCS#7 decrypt object sends cleanup past an unconditional PK11_FreeSymKey call and frees the same bulk key again. The path is confirmed for Thunderbird S/MIME; Firefox links the function, but Mozilla has not identified a reachable Firefox call path.

CVSS severity9.8
Critical
EPSS probability0.91%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Double-free in Mozilla Firefox before 133, Firefox ESR before 128.7, and Thunderbird before 133 allows attackers to corrupt memory. In sec_pkcs7_decoder_start_decrypt(), failure to create a PKCS#7 decrypt object sends cleanup past an unconditional PK11_FreeSymKey call and frees the same bulk key again. The path is confirmed for Thunderbird S/MIME; Firefox links the function, but Mozilla has not identified a reachable Firefox call path.

The record

CVE
CVE-2024-11704
Published
Nov 26, 2024
Updated
Nov 3, 2025
Vendor
Mozilla
Product
Firefox
Classifications
CWE-415
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 26, 2024CVE publishedPublication date reported by the CVE source.
  2. Nov 3, 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=0 <133
  2. Affected versionversion=unspecified <133

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Mozilla · Firefoxversion=0 <133; version=unspecified <133
Mozilla · Thunderbirdversion=0 <133; version=unspecified <128.7; version=unspecified <133
Mozilla · Firefox ESRversion=unspecified <128.7

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-415Double Free

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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