CVE-2021-45895: Netgen Tags Bundle 3.4.x before 3.4.11 and 4.0.x before 4.0.15 allows XSS in the Tags Admin interface.

Routine

MEDIUM 6.1UPGRADE

CVE-2021-45895 is a medium-severity flaw (CVSS 6.1) affecting tags bundle. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Netgen Tags Bundle 3.4.x before 3.4.11 and 4.0.x before 4.0.15 allows XSS in the Tags Admin interface.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	6.1 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.7% (top 47%)
CISA exploited list	No
Weakness	CWE-79
Published	2021-12-27
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: netgen

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

Am I affected?

Timeline

2021-12-27 21:15 UTCPublished CVE record published
2026-06-17 04:14 UTCUpdated Record last modified

netgen tags bundle UPGRADE

Affected: >= 3.4.0 and < 3.4.11 · >= 4.0.0 and < 4.0.15

Fixed in: 3.4.11, 4.0.15

Safe to downgrade to: a release before 3.4.0

1. Check installed version

apt-cache policy tags-bundle || rpm -q tags-bundle || tags-bundle --version

2. UPGRADE to 3.4.11 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade tags-bundle

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade tags-bundle

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 3.4.0 (Debian / Ubuntu)

apt-cache madison tags-bundle sudo apt install tags-bundle=<VERSION_BEFORE_3.4.0> sudo apt-mark hold tags-bundle

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

dnf --showduplicates list tags-bundle sudo dnf downgrade tags-bundle-<VERSION_BEFORE_3.4.0> sudo dnf versionlock add tags-bundle

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-2021-45895?

tags bundle: upgrade to 3.4.11, 4.0.15. Exact commands for each OS are on this page.

Is CVE-2021-45895 being exploited?

CVE-2021-45895 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-2021-45895 affect?

CVE-2021-45895 affects tags bundle. Severity is medium (CVSS 6.1). Netgen Tags Bundle 3.4.x before 3.4.11 and 4.0.x before 4.0.15 allows XSS in the Tags Admin interface.

How urgent is CVE-2021-45895?

Priority 35/100. No elevated risk signals yet.

References

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