CVE-2021-4327: A vulnerability was found in SerenityOS

Q: How do I fix CVE-2021-4327?

serenityos: upgrade to 2021-01-27. Exact commands for each OS are on this page.

Q: Is CVE-2021-4327 being exploited?

CVE-2021-4327 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2021-4327 affect?

CVE-2021-4327 affects serenityos. Severity is medium (CVSS 5.5). 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 t

Q: How urgent is CVE-2021-4327?

Priority 39/100. Public exploit reference

Routine

MEDIUM 5.5UPGRADE

CVE-2021-4327 is a medium-severity flaw (CVSS 5.5) affecting serenityos. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 release

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	5.5 (Medium)
Attack vector	Adjacent network
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.9% (top 39%)
CISA exploited list	No
Weakness	CWE-190
Published	2023-03-01
Last modified	2026-06-17

Publisher (CNA): VulDB · Vendor: serenityos

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2023-03-01 11:15 UTCPublished CVE record published
2026-06-17 04:19 UTCUpdated Record last modified

serenityos serenityos UPGRADE

Affected: < 2021-01-27

Fixed in: 2021-01-27

Safe to downgrade to: no unaffected older release

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2021-4327?

serenityos: upgrade to 2021-01-27. Exact commands for each OS are on this page.

Is CVE-2021-4327 being exploited?

CVE-2021-4327 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2021-4327 affect?

CVE-2021-4327 affects serenityos. Severity is medium (CVSS 5.5). 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 t

How urgent is CVE-2021-4327?

Priority 39/100. Public exploit reference

References

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