Is CVE-2021-3716 in the CISA KEV catalog?

No. CVE-2021-3716 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-3716?

CVE-2021-3716 has a CVSS v3 base score of 3.1 (LOW).

What is the EPSS score for CVE-2021-3716?

CVE-2021-3716 has an EPSS score of 0.56% (42th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-3716?

Upgrade nbdkit on debian 12 to 1.26.5-1 or later.

CVE & CISA-KEV Catalog

CVE-2021-3716

LOW

3.1

CVSS v3

NVD

Description

A flaw was found in nbdkit due to to improperly caching plaintext state across the STARTTLS encryption boundary. A MitM attacker could use this flaw to inject a plaintext NBD_OPT_STRUCTURED_REPLY before proxying everything else a client sends to the server, potentially leading the client to terminate the NBD session. The highest threat from this vulnerability is to system availability.

CWE-924

How to fix

Remediation Available

nbdkitDebian

Fixed in:1.26.5-1CVE-2021-3716

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 RequiredLow

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityLow

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

Exploit Intelligence

0.56%probability of exploitation in 30 days

42ndpercentile

Moderate risk: more likely to be exploited than 42% of all known CVEs.

References

Patch3

Third-Party Advisory1

openwall.com

Other references1

listman.redhat.com

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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.