What is CVE-2020-25756?

CVE-2020-25756 is a critical-severity vulnerability in Cesanta Mongoose, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 9.8/10. Published 2020-09-18.

How severe is CVE-2020-25756?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Buffer overflow in Cesanta Mongoose

CVE-2020-25756

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.

Vulnerability class: Buffer Overflow

EPSS: 0.016 (73.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Cesanta Mongoose — versions 6.18
N/a — versions n/a

Weakness classification (CWE)

CWE-120 — Buffer Copy without Checking Size of Input (Classic Buffer Overflow)

References

cve@mitre.org (Patch, Third Party Advisory, x_refsource_MISC, Issue Tracking)

Frequently asked questions

What is CVE-2020-25756?: CVE-2020-25756 is a critical-severity vulnerability in Cesanta Mongoose, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 9.8/10. Published 2020-09-18.
How severe is CVE-2020-25756?: Critical severity. CVSS v3 base score is 9.8 out of 10.