What is CVE-2020-21574?

CVE-2020-21574 is a high-severity vulnerability in C-Http Project, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 7.5/10. Published 2021-11-02.

How severe is CVE-2020-21574?

High severity. CVSS v3 base score is 7.5 out of 10.

Buffer overflow in C-Http Project

CVE-2020-21574

Buffer overflow vulnerability in YotsuyaNight c-http v0.1.0, allows attackers to cause a denial of service via a long url request which is passed to the delimitedread function.

Vulnerability class: Buffer Overflow

Published 2021-11-02 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.010 (60.8th percentile), scored 2026-10-01.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 61st percentile — 60.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.010 · newest: 0.010 · change: 0.000

Affected products

C-Http Project — versions 0.1.0

Weakness classification (CWE)

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

References

github.com/YotsuyaNight/c-http/issues/1 (Exploit, Third Party Advisory, Issue Tracking)

Frequently asked questions

What is CVE-2020-21574?: CVE-2020-21574 is a high-severity vulnerability in C-Http Project, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 7.5/10. Published 2021-11-02.
How severe is CVE-2020-21574?: High severity. CVSS v3 base score is 7.5 out of 10.