Memory corruption via unchecked TLS allocation failure
Published Feb 8, 2021 · Updated Aug 3, 2024
Out-of-bounds write in Cesanta Mongoose HTTPS server 7.0 allows remote attackers to corrupt memory through HTTPS connections. In mg_tls_init, a failed calloc returns NULL, but the function dereferences the pointer to initialize TLS state instead of rejecting the connection. An unauthenticated attacker must exhaust the server's memory pool with HTTPS requests; the resulting near-NULL write crashes the process or overwrites device configuration in some embedded environments.
Summary
What happened
Out-of-bounds write in Cesanta Mongoose HTTPS server 7.0 allows remote attackers to corrupt memory through HTTPS connections. In mg_tls_init, a failed calloc returns NULL, but the function dereferences the pointer to initialize TLS state instead of rejecting the connection. An unauthenticated attacker must exhaust the server's memory pool with HTTPS requests; the resulting near-NULL write crashes the process or overwrites device configuration in some embedded environments.
The record
- CVE
- CVE-2021-26530
- Published
- Feb 8, 2021
- Updated
- Aug 3, 2024
- Vendor
- Unknown vendor
- Product
- Unknown product
- Classifications
- CWE-787, T1499.003
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Feb 8, 2021CVE publishedPublication date reported by the CVE source.
- Aug 3, 2024Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
What conditions does exploitation require?
What is affected?
Affected products and versions are unavailable in this record.
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.
Public exploit references
- ErrorSanitizer allocation-failure reproductionproof of concept · demonstrated
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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