patch: double free in another_hunk function in pch.c
Published Mar 25, 2020
5.5
MEDIUMCVSS 3.1
EPSS 1.02%
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.
Affected products
No data.
No data.
Red Hat Enterprise Linux 5
patch
Out of support scope
Red Hat Enterprise Linux 6
patch
Out of support scope
Red Hat Enterprise Linux 7
patch
Fix deferred
Red Hat Enterprise Linux 8
patch
Fix deferred
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 5 | patch | Out of support scope | n/a |
| Red Hat Enterprise Linux 6 | patch | Out of support scope | n/a |
| Red Hat Enterprise Linux 7 | patch | Fix deferred | n/a |
| Red Hat Enterprise Linux 8 | patch | Fix deferred | n/a |
No package ranges for this CVE.
Remediation
Red Hat statement
This vulnerability was rated as LOW severity because it causes the application to crash, it doesn’t compromise system security, it can disrupt the application's normal function.
Metrics
No CVSS v4.0 score for this CVE.
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
AV:N/AC:M/Au:N/C:N/I:N/A:P
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
Score over time
2021–2026- EPSS v1
- EPSS v5
- EPSS v2
- EPSS v3
Percentile over time
- EPSS v1
- EPSS v5
- EPSS v2
- EPSS v3
Table of values (10 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 1.02% (0.01023) | 62.19th | v5 (v2026.06.15) |
| Sep 20, 2026 | 1.02% (0.01023) | 61.99th | v5 (v2026.06.15) |
| Jul 20, 2024 | 0.07% (0.00065) | 29.29th | v3 (v2023.03.01) |
| Jun 10, 2024 | 0.07% (0.00065) | 28.69th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.07% (0.00065) | 26.69th | v3 (v2023.03.01) |
| Mar 6, 2023 | 0.89% (0.00885) | 27.89th | v2 (v2022.01.01) |
| Apr 1, 2022 | 0.89% (0.00885) | 24.24th | v2 (v2022.01.01) |
| Jan 6, 2022 | 2.28% (0.02283) | 51.78th | v1 |
| Jan 5, 2022 | 0.52% (0.00518) | 31.20th | v5 (v2026.06.15) |
| Apr 14, 2021 | 0.52% (0.00518) | 0.00th | v1 |
References (5)
- https://access.redhat.com/security/cve/CVE-2019-20633 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1818934 Issue Tracking
- https://nvd.nist.gov/vuln/detail/CVE-2019-20633
- https://savannah.gnu.org/bugs/index.php?56683 x_refsource_MISCExploitVendor Advisory
- https://www.cve.org/CVERecord?id=CVE-2019-20633
| Link | Providers | Tags |
|---|---|---|
| https://access.redhat.com/security/cve/CVE-2019-20633 | Vendor Advisory | |
| https://bugzilla.redhat.com/show_bug.cgi?id=1818934 | Issue Tracking | |
| https://nvd.nist.gov/vuln/detail/CVE-2019-20633 | ||
| https://savannah.gnu.org/bugs/index.php?56683 | x_refsource_MISCExploitVendor Advisory | |
| https://www.cve.org/CVERecord?id=CVE-2019-20633 |
Change history (0)
No recorded changes yet.