Cookie injection via multipart response part headers
Published Feb 20, 2024 · Updated Feb 13, 2025
Cookie injection in Mozilla Firefox before 123, Firefox ESR before 115.8, and Thunderbird before 115.8 allows remote attackers to set cookies. The multipart/x-mixed-replace stream converter passes Set-Cookie headers from individual response parts into the cookie store instead of rejecting them. Exploitation requires control of both the response Content-Type and part of its body; successful abuse writes cookies for the response domain and alters session state.
Summary
What happened
Cookie injection in Mozilla Firefox before 123, Firefox ESR before 115.8, and Thunderbird before 115.8 allows remote attackers to set cookies. The multipart/x-mixed-replace stream converter passes Set-Cookie headers from individual response parts into the cookie store instead of rejecting them. Exploitation requires control of both the response Content-Type and part of its body; successful abuse writes cookies for the response domain and alters session state.
The record
- CVE
- CVE-2024-1551
- Published
- Feb 20, 2024
- Updated
- Feb 13, 2025
- Vendor
- Mozilla
- Product
- Firefox
- Classifications
- CWE-565
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Feb 20, 2024CVE publishedPublication date reported by the CVE source.
- Feb 13, 2025Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
Compare your product and version with the public record. A matching version still requires validation against your environment.
Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=unspecified <123
What conditions does exploitation require?
What is affected?
Published CVSS scores
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.
Weakness, pattern, technique
Public exploit references
- Multipart Set-Cookie response proof of conceptproof of concept · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
See the directory against your own environment.
Your stack
Check the software in your environment
Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.
Book a demo