Is CVE-2021-4255 in the CISA KEV catalog?

No. CVE-2021-4255 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-4255?

CVE-2021-4255 has a CVSS v3 base score of 3.5 (LOW).

What is the EPSS score for CVE-2021-4255?

CVE-2021-4255 has an EPSS score of 0.39% (30th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-4255?

Upgrade lenio to 2021-02-08 or later.

CVE & CISA-KEV Catalog

CVE-2021-4255

LOW

3.5

CVSS v3

NVD

Description

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.

CWE-707

How to fix

Remediation Available

lenioNVD

Affected:< 2021-02-08Fixed in:2021-02-08CVE-2021-4255derived from NVD

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredLow

User InteractionRequired

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityLow

AvailabilityNone

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N

Exploit Intelligence

0.39%probability of exploitation in 30 days

30thpercentile

Low risk: more likely to be exploited than 30% of all known CVEs.

References

Patch1

github.com

Third-Party Advisory1

vuldb.com

Related Vulnerabilities

Other CWE-707 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2024-10914	High	8.1	97%	-	-
CVE-2024-10915	High	8.1	79%	-	-
CVE-2024-43572	High	7.8	61%	KEV	Fix
CVE-2022-4257	Medium	6.3	44%	-	-
CVE-2025-26633	High	7.0	32%	KEV + Ransom	Fix
CVE-2022-3801	Medium	6.3	30%	-	-

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.