CVE-2021-4255: A vulnerability was found in ctrlo lenio and classified as problematic

Q: How do I fix CVE-2021-4255?

lenio: upgrade to 2021-02-08. Exact commands for each OS are on this page.

Q: Is CVE-2021-4255 being exploited?

CVE-2021-4255 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-2021-4255 affect?

CVE-2021-4255 affects lenio. Severity is low (CVSS 3.5). A vulnerability was found in ctrlo lenio and classified as problematic. Affected by this issue is some unknown functionality of the file views/contractor.tt. The manipulation of the argument contractor.name leads to cross site scripting. Th

Q: How urgent is CVE-2021-4255?

Priority 21/100. No elevated risk signals yet.

Routine

LOW 3.5UPGRADE

CVE-2021-4255 is a low-severity flaw (CVSS 3.5) affecting lenio. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A vulnerability was found in ctrlo lenio and classified as problematic. Affected by this issue is some unknown functionality of the file views/contractor.tt. The manipulation of the argument contractor.name leads to cross site scripting. The attack may be launched remotely. The name of the patch is e1646d5cd0a2fbab9eb505196dd2ca1c9e4cdd97. It is recommended to apply a patch to fix this issue. The identifier of this vulnerability is VDB-216212.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	3.5 (Low)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	Required
EPSS exploit chance	0.4% (top 64%)
CISA exploited list	No
Weakness	CWE-707
Published	2022-12-18
Last modified	2026-06-17

Publisher (CNA): VulDB · Vendor: ctrlo

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

Am I affected?

Timeline

2022-12-18 22:15 UTCPublished CVE record published
2026-06-17 04:19 UTCUpdated Record last modified

ctrlo lenio UPGRADE

Affected: < 2021-02-08

Fixed in: 2021-02-08

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 2021-02-08 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade lenio

Note

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

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-2021-4255?

lenio: upgrade to 2021-02-08. Exact commands for each OS are on this page.

Is CVE-2021-4255 being exploited?

CVE-2021-4255 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-2021-4255 affect?

CVE-2021-4255 affects lenio. Severity is low (CVSS 3.5). A vulnerability was found in ctrlo lenio and classified as problematic. Affected by this issue is some unknown functionality of the file views/contractor.tt. The manipulation of the argument contractor.name leads to cross site scripting. Th

How urgent is CVE-2021-4255?

Priority 21/100. No elevated risk signals yet.

Related CVEs

CVE-2021-4257 LOW 3.5 UPGRADE A vulnerability was found in ctrlo lenio
CVE-2021-4256 LOW 3.5 UPGRADE A vulnerability was found in ctrlo lenio
CVE-2021-4254 LOW 3.5 UPGRADE A vulnerability has been found in ctrlo lenio and classified as problematic
CVE-2021-4253 LOW 3.5 UPGRADE A vulnerability, which was classified as problematic, was found in ctrlo lenio

References

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