CVE-2021-31637: An issue found in UwAmp v.1.1, 1.2, 1.3, 2.0, 2.1, 2.2, 2.2.1, 3.0.0, 3.0.1, 3.0.2 allows a remote attacker to

Routine

HIGH 7.8UPGRADE

CVE-2021-31637 is a high-severity flaw (CVSS 7.8) affecting uwamp. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An issue found in UwAmp v.1.1, 1.2, 1.3, 2.0, 2.1, 2.2, 2.2.1, 3.0.0, 3.0.1, 3.0.2 allows a remote attacker to execute arbitrary code via a crafted DLL.

Why this priority

High severity

A fixed release or distro patch exists.

Risk facts

CVSS score	7.8 (High)
Attack vector	Local
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.3% (top 79%)
CISA exploited list	No
Weakness	CWE-427
Published	2023-03-16
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: uwamp project

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

Am I affected?

Timeline

2023-03-16 15:15 UTCPublished CVE record published
2026-06-17 03:52 UTCUpdated Record last modified

uwamp project uwamp UPGRADE

Affected: >= 1.1 and <= 3.0.2

Fixed in: newer than 3.0.2

Safe to downgrade to: a release before 1.1

1. Check installed version

apt-cache policy uwamp || rpm -q uwamp || uwamp --version

2. UPGRADE to newer than 3.0.2 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade uwamp

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade uwamp

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 1.1 (Debian / Ubuntu)

apt-cache madison uwamp sudo apt install uwamp=<VERSION_BEFORE_1.1> sudo apt-mark hold uwamp

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list uwamp sudo dnf downgrade uwamp-<VERSION_BEFORE_1.1> sudo dnf versionlock add uwamp

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

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-2021-31637?

uwamp: upgrade to newer than 3.0.2. Exact commands for each OS are on this page.

Is CVE-2021-31637 being exploited?

CVE-2021-31637 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-2021-31637 affect?

CVE-2021-31637 affects uwamp. Severity is high (CVSS 7.8). An issue found in UwAmp v.1.1, 1.2, 1.3, 2.0, 2.1, 2.2, 2.2.1, 3.0.0, 3.0.1, 3.0.2 allows a remote attacker to execute arbitrary code via a crafted DLL.

How urgent is CVE-2021-31637?

Priority 32/100. High severity

References

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