CVE-2024-6609Network attack vector

Memory corruption via invalid elliptic-curve key free

Published Jul 9, 2024 · Updated Nov 3, 2025

Memory corruption in NSS in Mozilla Firefox and Thunderbird before 128 allows remote attackers to corrupt process memory via crafted content. After calloc or malloc fails to allocate an elliptic-curve key, PORT_FreeArena_Util invokes PL_ClearArenaPool on memory that was never allocated. Exploitation requires user interaction and a near-out-of-memory state; observed behavior includes an AddressSanitizer-detected global buffer overflow.

CVSS severity8.8
High
EPSS probability0.58%
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 NSS in Mozilla Firefox and Thunderbird before 128 allows remote attackers to corrupt process memory via crafted content. After calloc or malloc fails to allocate an elliptic-curve key, PORT_FreeArena_Util invokes PL_ClearArenaPool on memory that was never allocated. Exploitation requires user interaction and a near-out-of-memory state; observed behavior includes an AddressSanitizer-detected global buffer overflow.

The record

CVE
CVE-2024-6609
Published
Jul 9, 2024
Updated
Nov 3, 2025
Vendor
Mozilla
Product
Firefox
Classifications
Unavailable
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 9, 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=unspecified <128

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Mozilla · Firefoxversion=unspecified <128
Mozilla · Thunderbirdversion=unspecified <128

Published CVSS scores

4.7SUSECVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:N/I:L/A:L
8.8CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
8.8National Vulnerability DatabaseCVSS: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

No sourced classifications are available.

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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