Is CVE-2021-3911 in the CISA KEV catalog?

No. CVE-2021-3911 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-3911?

CVE-2021-3911 has a CVSS v3 base score of 4.2 (MEDIUM).

What is the EPSS score for CVE-2021-3911?

CVE-2021-3911 has an EPSS score of 0.88% (55th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-3911?

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

CVE & CISA-KEV Catalog

CVE-2021-3911

MEDIUM

4.2

CVSS v3

NVD

Description

If the ROA that a repository returns contains too many bits for the IP address then OctoRPKI will crash.

CWE-20Improper Input Validation CWE-252

How to fix

Remediation Available

cfrpkiDebian

Fixed in:1.4.2-1~deb11u1CVE-2021-3911

Fixed in:1.4.0-1CVE-2021-3911

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 InteractionRequired

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

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

Exploit Intelligence

0.88%probability of exploitation in 30 days

55thpercentile

Moderate risk: more likely to be exploited than 55% of all known CVEs.

References

Third-Party Advisory2

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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.