CVE-2024-4777Network attack vector

Arbitrary code execution via memory corruption

Published May 14, 2024 · Updated Mar 13, 2025

Memory-safety flaws in Mozilla Firefox before 126, Firefox ESR before 115.11, and Thunderbird before 115.11 allow code execution. Mozilla identified evidence of memory corruption across two underlying bugs but has not publicly disclosed the affected code loci or erroneous memory operations. Exploitation requires remote delivery of crafted client-side content and user interaction; successful execution occurs in the application context.

CVSS severity7.5
High
EPSS probability0.54%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Memory-safety flaws in Mozilla Firefox before 126, Firefox ESR before 115.11, and Thunderbird before 115.11 allow code execution. Mozilla identified evidence of memory corruption across two underlying bugs but has not publicly disclosed the affected code loci or erroneous memory operations. Exploitation requires remote delivery of crafted client-side content and user interaction; successful execution occurs in the application context.

The record

CVE
CVE-2024-4777
Published
May 14, 2024
Updated
Mar 13, 2025
Vendor
Mozilla
Product
Firefox
Classifications
CWE-120, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 14, 2024CVE publishedPublication date reported by the CVE source.
  2. Mar 13, 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 <126
  2. Affected versionversion=unspecified <126

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Mozilla · Firefoxversion=0 <126; version=unspecified <126
Mozilla · Thunderbirdversion=0 <115.11; version=unspecified <115.11
Mozilla · Firefox ESRversion=0 <115.11; version=unspecified <115.11

Published CVSS scores

8.8NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
7.5CISA-ADPCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
6.1Red HatCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

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-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
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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