What is CVE-2021-4327?

CVE-2021-4327 is a medium-severity vulnerability in Serenityos, classified under Integer Overflow or Wraparound. CVSS score: 5.5/10. Published 2023-03-01.

How severe is CVE-2021-4327?

Medium severity. CVSS v3 base score is 5.5 out of 10.

Is CVE-2021-4327 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Integer overflow in Serenityos

CVE-2021-4327

A vulnerability was found in SerenityOS. It has been rated as critical. Affected by this issue is the function initialize_typed_array_from_array_buffer in the library Userland/Libraries/LibJS/Runtime/TypedArray.cpp. The manipulation leads to integer overflow. The exploit has been disclosed to the public and may be used. Continious delivery with rolling releases is used by this product. Therefore, no version details of affected nor updated releases are available. The patch is identified as f6c6047e49f1517778f5565681fb64750b14bf60. It is recommended to apply a patch to fix this issue. VDB-222074 is the identifier assigned to this vulnerability.

Vulnerability class: Integer Overflow

Published 2023-03-01 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L.

EPSS exploit prediction

EPSS: 0.009 (59.2th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 59th percentile — 59.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.009 · newest: 0.009 · change: 0.000

Affected products

Serenityos
Serenityos

Weakness classification (CWE)

CWE-190 — Integer Overflow or Wraparound

Public proof-of-concept exploits

coroutine-cfop/cfop

References

vuldb.com/ (Permissions Required, technical-description, Third Party Advisory, vdb-entry)
vuldb.com/ (signature, Permissions Required, permissions-required, Third Party Advisory)
devcraft.io/2021/02/11/serenityos-writing-a-full-chain-exploit.html (Exploit, Third Party Advisory, exploit)
github.com/SerenityOS/serenity/commit/f6c6047e49f1517778f5565681fb64750b14bf60 (Patch, patch)

Frequently asked questions

What is CVE-2021-4327?: CVE-2021-4327 is a medium-severity vulnerability in Serenityos, classified under Integer Overflow or Wraparound. CVSS score: 5.5/10. Published 2023-03-01.
How severe is CVE-2021-4327?: Medium severity. CVSS v3 base score is 5.5 out of 10.
Is CVE-2021-4327 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.