CVE-2021-20193
LOWCVSS 3.3/10EPSS 1.09%
Last modified
CVE-2021-20193 is a low-severity vulnerability rated 3.3/10 on the CVSS scale. A flaw was found in the src/list.c of tar 1.33 and earlier. This flaw allows an attacker who can submit a crafted input file to tar to cause uncontrolled consumption of memory. EPSS estimates a 1.09% chance of exploitation in the next 30 days.
Description
A flaw was found in the src/list.c of tar 1.33 and earlier. This flaw allows an attacker who can submit a crafted input file to tar to cause uncontrolled consumption of memory. The highest threat from this vulnerability is to system availability.
Metrics
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Gnu | Tar | <= 1.33 |
References
- https://bugzilla.redhat.com/show_bug.cgi?id=1917565Issue Tracking, Patch, Third Party Advisory
- https://git.savannah.gnu.org/cgit/tar.git/commit/?id=d9d4435692150fa8ff68e1b1a473d187cc3fd777Mailing List, Patch, Third Party Advisory
- https://savannah.gnu.org/bugs/?59897Issue Tracking, Patch, Vendor Advisory
- https://security.gentoo.org/glsa/202105-29Third Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1917565Issue Tracking, Patch, Third Party Advisory
- https://git.savannah.gnu.org/cgit/tar.git/commit/?id=d9d4435692150fa8ff68e1b1a473d187cc3fd777Mailing List, Patch, Third Party Advisory
- https://savannah.gnu.org/bugs/?59897Issue Tracking, Patch, Vendor Advisory
- https://security.gentoo.org/glsa/202105-29Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Analyzed
Frequently Asked Questions
What is CVE-2021-20193?
A flaw was found in the src/list.c of tar 1.33 and earlier. This flaw allows an attacker who can submit a crafted input file to tar to cause uncontrolled consumption of memory. The highest threat from this vulnerability is to system availability.
How severe is CVE-2021-20193?
CVE-2021-20193 has a CVSS score of 3.3/10 (LOW severity). The EPSS model estimates a 1.09% probability of exploitation in the next 30 days.
How do I fix CVE-2021-20193?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
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Are you affected by CVE-2021-20193?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST