CVE-2019-20633
CVE-2019-20633 is a medium-severity vulnerability in Gnu Patch 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-415.
Key facts
- Severity: Medium (CVSS 3.x base score 5.5)
- CVSS v2: 4.3
- EPSS exploit prediction: 1% (59th percentile)
- Actively exploited: Not listed in CISA KEV
- Weakness: CWE-415
- Affected product: Gnu Patch
- Published:
- Last modified:
Description
GNU patch through 2.7.6 contains a free(p_line[p_end]) Double Free vulnerability in the function another_hunk in pch.c that can cause a denial of service via a crafted patch file. NOTE: this issue exists because of an incomplete fix for CVE-2018-6952.
Frequently asked questions
- What is CVE-2019-20633?
- GNU patch through 2.7.6 contains a free(p_line[p_end]) Double Free vulnerability in the function another_hunk in pch.c that can cause a denial of service via a crafted patch file. NOTE: this issue exists because of an incomplete fix for CVE-2018-6952.
- How severe is CVE-2019-20633?
- CVE-2019-20633 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 none, and availability high.
- Is CVE-2019-20633 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (59th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2019-20633?
- CVE-2019-20633 affects Gnu Patch. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2019-20633?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
- When was CVE-2019-20633 published?
- CVE-2019-20633 was published on 2020-03-25 and last updated on 2026-06-17.
References
Affected products (1)
- cpe:2.3:a:gnu:patch:*:*:*:*:*:*:*:*
More vulnerabilities in Gnu Patch
- CVE-2018-20969 — High (CVSS 7.8): do_ed_script in pch.c in GNU patch through 2.7.6 does not block strings beginning with a ! character. NOTE: this is the…
- CVE-2019-13638 — High (CVSS 7.8): GNU patch through 2.7.6 is vulnerable to OS shell command injection that can be exploited by opening a crafted patch…
- CVE-2018-1000156 — High (CVSS 7.8): GNU Patch version 2.7.6 contains an input validation vulnerability when processing patch files, specifically the…
- CVE-2015-1396 — High (CVSS 7.5): A Directory Traversal vulnerability exists in the GNU patch before 2.7.4. A remote attacker can write to arbitrary…
- CVE-2018-6952 — High (CVSS 7.5): A double free exists in the another_hunk function in pch.c in GNU patch through 2.7.6.
- CVE-2018-6951 — High (CVSS 7.5): An issue was discovered in GNU patch through 2.7.6. There is a segmentation fault, associated with a NULL pointer…
All CVEs affecting Gnu Patch →
Other CWE-415 (Double Free) vulnerabilities
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- CVE-2020-37239 — Critical (CVSS 9.8): libbabl 0.1.62 contains a broken double free detection vulnerability that allows attackers to bypass memory safety…
- CVE-2026-43011 — Critical (CVSS 9.8): In the Linux kernel, the following vulnerability has been resolved: net/x25: Fix potential double free of skb When…
- CVE-2026-31609 — Critical (CVSS 9.8): In the Linux kernel, the following vulnerability has been resolved: smb: client: avoid double-free in…
- CVE-2026-31608 — Critical (CVSS 9.8): In the Linux kernel, the following vulnerability has been resolved: smb: server: avoid double-free in…