Is CVE-2021-3910 in the CISA KEV catalog?

No. CVE-2021-3910 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-3910?

CVE-2021-3910 has a CVSS v3 base score of 4.4 (MEDIUM).

What is the EPSS score for CVE-2021-3910?

CVE-2021-3910 has an EPSS score of 1.26% (66th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-3910?

Upgrade cfrpki on debian 11 to 1.4.2-1~deb11u1 or later.

CVE & CISA-KEV Catalog

CVE-2021-3910

MEDIUM

4.4

CVSS v3

NVD

Description

OctoRPKI crashes when encountering a repository that returns an invalid ROA (just an encoded NUL (\0) character).

CWE-20Improper Input Validation

How to fix

Remediation Available

cfrpkiDebian

Fixed in:1.4.2-1~deb11u1CVE-2021-3910

Fixed in:1.4.0-1CVE-2021-3910

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 ComplexityHigh

Privileges RequiredHigh

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

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

Exploit Intelligence

1.26%probability of exploitation in 30 days

66thpercentile

Moderate risk: more likely to be exploited than 66% of all known CVEs.

References

Third-Party Advisory2

Related Vulnerabilities

Other CWE-20 (Improper Input Validation) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2024-3400	Critical	10.0	100%	KEV + Ransom	-
CVE-2021-45105	Medium	5.9	100%	-	Fix
CVE-2021-44228	Critical	10.0	100%	KEV + Ransom	Fix
CVE-2021-21985	Critical	9.8	100%	KEV + Ransom	Fix
CVE-2018-7600	Critical	9.8	100%	KEV + Ransom	Fix
CVE-2020-3452	High	7.5	100%	KEV	Fix

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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 2026-04-15.