CVE-2021-26530
CVSS v3
9.1
CRITICAL
EPSS Score
1.5 %
exploit probability, as of 2026-09-25
CISA KEV
No
known exploited
Exploitation
—
SSVC status
Description
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.
Technical details
- Published
- 2021-02-08
Frequently asked questions
What is CVE-2021-26530?
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.
Is CVE-2021-26530 actively exploited?
Active exploitation of CVE-2021-26530 has not been confirmed. Its EPSS score was 1.5% on 2026-09-25, the estimated probability of exploitation in the next 30 days.
What is the CVSS score for CVE-2021-26530?
CVE-2021-26530 has a CVSS v3 base score of 9.1 (CRITICAL severity).
Is CVE-2021-26530 affecting your environment?
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