Is CVE-2021-21373 in the CISA KEV catalog?

No. CVE-2021-21373 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-21373?

CVE-2021-21373 has a CVSS v3 base score of 7.5 (HIGH).

What is the EPSS score for CVE-2021-21373?

CVE-2021-21373 has an EPSS score of 1.16% (64th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-21373?

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

CVE & CISA-KEV Catalog

CVE-2021-21373

HIGH

7.5

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 by default. In case of error it falls back to a non-TLS URL http://irclogs.nim-lang.org/packages.json. 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-295Improper Certificate Validation

How to fix

Remediation Available

nimDebian

Fixed in:1.4.6+really1.4.2-1CVE-2021-21373

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

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 InteractionRequired

ScopeChanged

Impact

ConfidentialityLow

IntegrityHigh

AvailabilityLow

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

Exploit Intelligence

1.16%probability of exploitation in 30 days

64thpercentile

Moderate risk: more likely to be exploited than 64% of all known CVEs.

References

Exploit1

consensys.net

Third-Party Advisory2

Related Vulnerabilities

Other CWE-348 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2025-59951	Critical	9.1	4.7%	-	-
CVE-2022-31813	Critical	9.8	3.1%	-	Fix
CVE-2024-45410	Critical	9.8	1.5%	-	Fix
CVE-2021-21374	High	8.1	1.0%	-	Fix
CVE-2022-2255	High	7.5	0.7%	-	Fix
CVE-2022-4539	Medium	5.3	0.6%	-	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 2024-11-21.