CVE-2020-25756

9.8 criticalEPSS 1.6%

Critical (9.8) in cesanta mongoose. EPSS 1.6% chance of exploitation in the next 30 days.

A buffer overflow vulnerability exists in the mg_get_http_header function in Cesanta Mongoose 6.18 due to a lack of bounds checking. A crafted HTTP header can exploit this bug. NOTE: a committer has stated "this will not happen in practice.

Severity

CVSS 3.1

9.8 critical

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS: 1.6% chance of exploitation in the next 30 days; higher than 76% of CVEs (scores of 2026-10-31)
CWE: CWE-120
Published: 2020-09-18
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

cesanta:mongoose

References

https://github.com/cesanta/mongoose/issues/1135
https://github.com/cesanta/mongoose/issues/1135

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