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CVE-2021-33643
An attacker who submits a crafted tar file with size in header struct being 0 may be able to trigger an calling of malloc(0) for a…
Medium6.5EPSS 1.9%
- Published
- Updated
- Reserved
- Assigned by
- openEuler
Description
An attacker who submits a crafted tar file with size in header struct being 0 may be able to trigger an calling of malloc(0) for a variable gnu_longlink, causing an out-of-bounds read.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| CISA-ADPADP (enrichment) | 3.1 | Medium6.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L |
| NVDNVD · Modified | 3.1 | Critical9.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H |
- EPSS (exploitation in 30 days)
- 1.9% · top 20% of all CVEs (6 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: yes · Technical impact: partial
Loading the EPSS history…
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 6.5.
Weakness
Affected products
libtar
- affected <1.2.21
References (7)
- https://www.openeuler.org/en/security/safety-bulletin/detail.html?id=openEuler-SA-2022-1807 (opens in a new tab)x_transferred
- FEDORA-2022-fe1a4e3cf0 (opens in a new tab)vendor-advisoryx_transferred
- FEDORA-2022-50e8a1b51d (opens in a new tab)vendor-advisoryx_transferred
- FEDORA-2022-44a20bba43 (opens in a new tab)vendor-advisoryx_transferred
- FEDORA-2022-88772d0a2d (opens in a new tab)vendor-advisoryx_transferred
- FEDORA-2022-ccc68b06cc (opens in a new tab)vendor-advisoryx_transferred
- https://lists.debian.org/debian-lts-announce/2025/01/msg00026.html (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2021-33643)Record last updated .