CVE-2021-40633
CVSS v3
8.8
HIGH
EPSS Score
1.7 %
exploit probability, as of 2026-09-25
CISA KEV
No
known exploited
Exploitation
—
SSVC status
Description
A memory leak (out-of-memory) in gif2rgb in util/gif2rgb.c in giflib 5.1.4 allows remote attackers trigger an out of memory exception or denial of service via a gif format file.
Technical details
- Published
- 2022-06-14
Frequently asked questions
What is CVE-2021-40633?
A memory leak (out-of-memory) in gif2rgb in util/gif2rgb.c in giflib 5.1.4 allows remote attackers trigger an out of memory exception or denial of service via a gif format file.
Is CVE-2021-40633 actively exploited?
Active exploitation of CVE-2021-40633 has not been confirmed. Its EPSS score was 1.7% on 2026-09-25, the estimated probability of exploitation in the next 30 days.
What is the CVSS score for CVE-2021-40633?
CVE-2021-40633 has a CVSS v3 base score of 8.8 (HIGH severity).
Is CVE-2021-40633 affecting your environment?
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