How severe is CVE-2020-23171?

CVE-2020-23171 has a CVSS 3.x base score of 5.5, rated medium severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity high, and availability none.

Is CVE-2020-23171 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (47th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-23171?

CVE-2020-23171 affects Nim-lang. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-23171?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2020-23171 published?

CVE-2020-23171 was published on 2021-08-10 and last updated on 2026-06-17.

CVE-2020-23171

CVE-2020-23171 is a medium-severity vulnerability in Nim-lang with a CVSS 3.x base score of 5.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-610.

Key facts

Severity: Medium (CVSS 3.x base score 5.5)
CVSS v2: 4.3
EPSS exploit prediction: 1% (47th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-610
Affected product: Nim-lang
Published: 2021-08-10
Last modified: 2026-06-17

Description

A vulnerability in all versions of Nim-lang allows unauthenticated attackers to write files to arbitrary directories via a crafted zip file with dot-slash characters included in the name of the crafted file.

Frequently asked questions

What is CVE-2020-23171?: A vulnerability in all versions of Nim-lang allows unauthenticated attackers to write files to arbitrary directories via a crafted zip file with dot-slash characters included in the name of the crafted file.
How severe is CVE-2020-23171?: CVE-2020-23171 has a CVSS 3.x base score of 5.5, rated medium severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity high, and availability none.
Is CVE-2020-23171 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (47th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-23171?: CVE-2020-23171 affects Nim-lang. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-23171?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2020-23171 published?: CVE-2020-23171 was published on 2021-08-10 and last updated on 2026-06-17.

References

https://github.com/nim-lang/zip/issues/54

Affected products (1)

cpe:2.3:a:nim-lang:nim-lang:*:*:*:*:*:*:*:*

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