# DLA-4033-1: libtar security update

DLA-4033-1, released January 28, 2025, fixes 1 CVE in libtar (version 1.2.20-8+deb12u1~deb11u1). None of them is reported as exploited. Patch Radar priority: High. The product is no longer supported.

- Web page: https://patchblox.com/security/fix/linux/dla-4033-1
- Platform: Linux
- Released: Jan 28, 2025
- Priority: High (Closes CVE-2021-33643, high severity)
- CVEs: 1, exploited: 0, on CISA KEV: 0
- Vendor advisory: https://security-tracker.debian.org/tracker/CVE-2021-33643

## Applies to

| Product | Release | Fixed in |
|---|---|---|
| [libtar](https://patchblox.com/security/data/product/linux/libtar.md) | Debian 11.6 (bullseye) | 1.2.20-8+deb12u1~deb11u1 |

## CVEs this fix closes

| CVE | Priority | Title | CVSS | EPSS | Exploitation |
|---|---|---|---:|---:|---|
| [CVE-2021-33643](https://patchblox.com/security/data/cve/CVE-2021-33643.md) | High | libtar0t64: An attacker who submits a crafted tar file with size in header struct being0 may be able to trigger an calling of mal... | 9.1 | 0.0188 |  |

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Data as of 2026-11-07T06:34:28Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo