optipng: global buffer overflow in gifread.c:LZWReadByte when parsing malicious GIF
Published Nov 24, 2017
7.8
HIGHCVSS 3.0
EPSS 1.79%
Description
A global buffer overflow in OptiPNG 0.7.6 allows remote attackers to cause a denial-of-service attack or other unspecified impact with a maliciously crafted GIF format file, related to an uncontrolled loop in the LZWReadByte function of the gifread.c file.
Affected products
No data.
- 0.7.6
No data.
Red Hat Enterprise Linux 7
optipng
Will not fix
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 7 | optipng | Will not fix | n/a |
No package ranges for this CVE.
Remediation
Red Hat statement
Red Hat Product Security has rated this issue as having Low security impact. This issue is not currently planned to be addressed in future updates. For additional information, refer to the Issue Severity Classification: https://access.redhat.com/security/updates/classification/.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
1 other source (Red Hat) ▾
CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L
AV:N/AC:M/Au:N/C:P/I:P/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
- EPSS v4
Percentile over time
- EPSS v1
- EPSS v5
- EPSS v2
- EPSS v3
- EPSS v4
Table of values (22 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 1.79% (0.01791) | 77.57th | v5 (v2026.06.15) |
| Sep 22, 2026 | 1.79% (0.01791) | 77.40th | v5 (v2026.06.15) |
| Sep 21, 2026 | 2.99% (0.02989) | 86.67th | v5 (v2026.06.15) |
| Sep 6, 2026 | 1.79% (0.01791) | 76.91th | v5 (v2026.06.15) |
| Sep 5, 2026 | 2.99% (0.02989) | 86.38th | v5 (v2026.06.15) |
| Aug 30, 2026 | 1.79% (0.01791) | 76.80th | v5 (v2026.06.15) |
| Aug 28, 2026 | 2.99% (0.02989) | 86.30th | v5 (v2026.06.15) |
| Aug 24, 2026 | 1.79% (0.01791) | 76.67th | v5 (v2026.06.15) |
| Aug 23, 2026 | 2.99% (0.02989) | 86.24th | v5 (v2026.06.15) |
| Jun 15, 2026 | 1.79% (0.01791) | 75.44th | v5 (v2026.06.15) |
| Mar 17, 2025 | 0.18% (0.00179) | 37.22th | v4 (v2025.03.14) |
| Jul 20, 2024 | 0.59% (0.00594) | 78.56th | v3 (v2023.03.01) |
| Apr 10, 2024 | 0.59% (0.00594) | 78.02th | v3 (v2023.03.01) |
| Feb 8, 2024 | 0.51% (0.00510) | 75.91th | v3 (v2023.03.01) |
| Dec 10, 2023 | 0.51% (0.00510) | 73.91th | v3 (v2023.03.01) |
| Nov 4, 2023 | 0.43% (0.00426) | 71.57th | v3 (v2023.03.01) |
| Oct 4, 2023 | 0.36% (0.00360) | 69.01th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.30% (0.00300) | 64.67th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.21% (0.01213) | 66.61th | v2 (v2022.01.01) |
| Feb 4, 2022 | 1.21% (0.01213) | 40.54th | v2 (v2022.01.01) |
| Feb 3, 2022 | 1.31% (0.01306) | 31.19th | v5 (v2026.06.15) |
| Apr 14, 2021 | 1.31% (0.01306) | 0.00th | v1 |
References (8)
- https://access.redhat.com/security/cve/CVE-2017-16938 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1520227 Issue Tracking
- https://lists.debian.org/debian-lts-announce/2017/11/msg00042.html mailing-listx_refsource_MLIST
- https://nvd.nist.gov/vuln/detail/CVE-2017-16938
- https://security.gentoo.org/glsa/201801-02 vendor-advisoryx_refsource_GENTOO
- https://sourceforge.net/p/optipng/bugs/69/ x_refsource_MISCPatchThird Party Advisory
- https://www.cve.org/CVERecord?id=CVE-2017-16938
- https://www.debian.org/security/2017/dsa-4058 vendor-advisoryx_refsource_DEBIAN
| Link | Providers | Tags |
|---|---|---|
| https://access.redhat.com/security/cve/CVE-2017-16938 | Vendor Advisory | |
| https://bugzilla.redhat.com/show_bug.cgi?id=1520227 | Issue Tracking | |
| https://lists.debian.org/debian-lts-announce/2017/11/msg00042.html | mailing-listx_refsource_MLIST | |
| https://nvd.nist.gov/vuln/detail/CVE-2017-16938 | ||
| https://security.gentoo.org/glsa/201801-02 | vendor-advisoryx_refsource_GENTOO | |
| https://sourceforge.net/p/optipng/bugs/69/ | x_refsource_MISCPatchThird Party Advisory | |
| https://www.cve.org/CVERecord?id=CVE-2017-16938 | ||
| https://www.debian.org/security/2017/dsa-4058 | vendor-advisoryx_refsource_DEBIAN |
Change history (0)
No recorded changes yet.