CVE-2021-26530 json
The mg_tls_init function in Cesanta Mongoose HTTPS server 7.0 (compiled with OpenSSL support) is vulnerable to remote OOB write attack via…
published 2021-02-08 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-13334
- cvss
- 9.1
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 1.5%
- EPSS 1.5% chance of exploitation in 30 days, percentile 74%
- public exploits
- 0
- none known
Summary
The mg_tls_init function in Cesanta Mongoose HTTPS server 7.0 (compiled with OpenSSL support) is vulnerable to remote OOB write attack via connection request after exhausting memory pool.
Patch / fix
- swupdate Debian 14, Debian 13, Debian 12 2022.12+dfsg-1
debian advisories DEBIAN-CVE-2021-26530
Exploit prediction
1.51% chance of exploitation in the next 30 days, higher than 74% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- github.com https://github.com/cesanta/mongoose/issues/1204 referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.1 | 9.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H |
| NVD | 2.0 | 6.4 | AV:N/AC:L/Au:N/C:N/I:P/A:P |
Classification
- Weakness
-
- CWE-787 Out-of-bounds Write
References
-
github.com
/cesanta/mongoose/issues/1204
exploit, third-party-advisory
Sources
- CVE List CVE-2021-26530
- NVD CVE-2021-26530
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