CVE-2021-45379: Glewlwyd 2.0.0, fixed in 2.6.1 is affected by an incorrect access control vulnerability

This month

HIGH 8.8UPGRADE

CVE-2021-45379 is a high-severity flaw (CVSS 8.8) affecting glewlwyd. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Glewlwyd 2.0.0, fixed in 2.6.1 is affected by an incorrect access control vulnerability. One user can attempt to log in as another user without its password.

Why this priority

High severity

A fixed release or distro patch exists.

Risk facts

CVSS score	8.8 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	1.0% (top 36%)
CISA exploited list	No
Weakness	CWE-287
Published	2021-12-30
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: glewlwyd project

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

Am I affected?

Timeline

2021-12-30 18:15 UTCPublished CVE record published
2026-06-17 04:13 UTCUpdated Record last modified

glewlwyd project glewlwyd UPGRADE

Affected: >= 2.0.0 and < 2.6.1

Fixed in: 2.6.1

Safe to downgrade to: a release before 2.0.0

1. Check installed version

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

2. UPGRADE to 2.6.1 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade glewlwyd

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 2.0.0 (Debian / Ubuntu)

apt-cache madison glewlwyd sudo apt install glewlwyd=<VERSION_BEFORE_2.0.0> sudo apt-mark hold glewlwyd

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

dnf --showduplicates list glewlwyd sudo dnf downgrade glewlwyd-<VERSION_BEFORE_2.0.0> sudo dnf versionlock add glewlwyd

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-2021-45379?

glewlwyd: upgrade to 2.6.1. Exact commands for each OS are on this page.

Is CVE-2021-45379 being exploited?

CVE-2021-45379 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-2021-45379 affect?

CVE-2021-45379 affects glewlwyd. Severity is high (CVSS 8.8). Glewlwyd 2.0.0, fixed in 2.6.1 is affected by an incorrect access control vulnerability. One user can attempt to log in as another user without its password.

How urgent is CVE-2021-45379?

Priority 47/100. High severity

Related CVEs

CVE-2022-29967 HIGH 7.5 UPGRADE static_compressed_inmemory_website_callback.c in Glewlwyd through 2.6.2 allows directory traversal.

References

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