Is CVE-2021-21374 in the CISA KEV catalog?

No. CVE-2021-21374 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-21374?

CVE-2021-21374 has a CVSS v3 base score of 8.1 (HIGH).

What is the EPSS score for CVE-2021-21374?

CVE-2021-21374 has an EPSS score of 1.03% (60th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-21374?

Upgrade nim on debian 11 to 1.4.6+really1.4.2-1 or later.

CVE & CISA-KEV Catalog

CVE-2021-21374

HIGH

8.1

CVSS v3

NVD

Description

Nimble is a package manager for the Nim programming language. In Nim release versions before versions 1.2.10 and 1.4.4, "nimble refresh" fetches a list of Nimble packages over HTTPS without full verification of the SSL/TLS certificate due to the default setting of httpClient. An attacker able to perform MitM can deliver a modified package list containing malicious software packages. If the packages are installed and used the attack escalates to untrusted code execution.

CWE-348 CWE-349 CWE-599 CWE-295Improper Certificate Validation

How to fix

Remediation Available

nimDebian

Fixed in:1.4.6+really1.4.2-1CVE-2021-21374

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 RequiredNone

User InteractionNone

ScopeChanged

Impact

ConfidentialityLow

IntegrityHigh

AvailabilityLow

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

Exploit Intelligence

1.03%probability of exploitation in 30 days

60thpercentile

Moderate risk: more likely to be exploited than 60% of all known CVEs.

References

Patch1

github.com

Exploit1

consensys.net

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.