How severe is CVE-2021-32840?

CVE-2021-32840 has a CVSS 3.x base score of 7.3, rated high severity. It is exploitable over local access with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity high, and availability low.

Is CVE-2021-32840 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (78th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-32840?

CVE-2021-32840 affects Sharpziplib Project Sharpziplib. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-32840?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2021-32840 published?

CVE-2021-32840 was published on 2022-01-26 and last updated on 2026-06-17.

CVE-2021-32840

CVE-2021-32840 is a high-severity vulnerability in Sharpziplib Project Sharpziplib with a CVSS 3.x base score of 7.3. 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-22.

Key facts

Severity: High (CVSS 3.x base score 7.3)
CVSS v2: 7.5
EPSS exploit prediction: 2% (78th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-22
Affected product: Sharpziplib Project Sharpziplib
Published: 2022-01-26
Last modified: 2026-06-17

Description

SharpZipLib (or #ziplib) is a Zip, GZip, Tar and BZip2 library. Prior to version 1.3.3, a TAR file entry `../evil.txt` may be extracted in the parent directory of `destFolder`. This leads to arbitrary file write that may lead to code execution. The vulnerability was patched in version 1.3.3.

Frequently asked questions

What is CVE-2021-32840?: SharpZipLib (or #ziplib) is a Zip, GZip, Tar and BZip2 library. Prior to version 1.3.3, a TAR file entry `../evil.txt` may be extracted in the parent directory of `destFolder`. This leads to arbitrary file write that may lead to code execution. The vulnerability was patched in version 1.3.3.
How severe is CVE-2021-32840?: CVE-2021-32840 has a CVSS 3.x base score of 7.3, rated high severity. It is exploitable over local access with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity high, and availability low.
Is CVE-2021-32840 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (78th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-32840?: CVE-2021-32840 affects Sharpziplib Project Sharpziplib. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-32840?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2021-32840 published?: CVE-2021-32840 was published on 2022-01-26 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:sharpziplib_project:sharpziplib:*:*:*:*:*:*:*:*

More vulnerabilities in Sharpziplib Project Sharpziplib

CVE-2018-1002208 — Medium (CVSS 5.5): SharpZipLib before 1.0 RC1 is vulnerable to directory traversal, allowing attackers to write to arbitrary files via a…
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CVE-2021-32842 — Medium (CVSS 4.0): SharpZipLib (or #ziplib) is a Zip, GZip, Tar and BZip2 library. Starting version 1.0.0 and prior to version 1.3.3, a…

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