What is CVE-2021-30045?

CVE-2021-30045 is a critical-severity vulnerability in Serenityos, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 9.1/10. Published 2021-04-06.

How severe is CVE-2021-30045?

Critical severity. CVSS v3 base score is 9.1 out of 10.

Buffer overflow in Serenityos

CVE-2021-30045

SerenityOS 2021-03-27 contains a buffer overflow vulnerability in the EndOfCentralDirectory::read() function.

Vulnerability class: Buffer Overflow

Published 2021-04-06 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H.

EPSS exploit prediction

EPSS: 0.018 (78.0th percentile), scored 2026-10-01.

Low probability of exploitation in the next 30 days, but still tracked. 78th percentile — 78.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.018 · newest: 0.018 · change: 0.000

Affected products

Serenityos — versions 2021-03-27

Weakness classification (CWE)

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

References

github.com/SerenityOS/serenity/issues/5975 (Third Party Advisory)
github.com/SerenityOS/serenity/pull/5977 (Third Party Advisory)
github.com/SerenityOS/serenity/commit/4317db7498eaa5a37068052bb0310fbc6a5f78e4 (Patch, Third Party Advisory)

Frequently asked questions

What is CVE-2021-30045?: CVE-2021-30045 is a critical-severity vulnerability in Serenityos, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 9.1/10. Published 2021-04-06.
How severe is CVE-2021-30045?: Critical severity. CVSS v3 base score is 9.1 out of 10.