CVE-2021-29939
CVSS v3
7.3
HIGH
EPSS Score
1.0 %
exploit probability, as of 2026-09-25
CISA KEV
No
known exploited
Exploitation
—
SSVC status
Description
An issue was discovered in the stackvector crate through 2021-02-19 for Rust. There is an out-of-bounds write in StackVec::extend if size_hint provides certain anomalous data.
Technical details
- Published
- 2021-04-01
Frequently asked questions
What is CVE-2021-29939?
An issue was discovered in the stackvector crate through 2021-02-19 for Rust. There is an out-of-bounds write in StackVec::extend if size_hint provides certain anomalous data.
Is CVE-2021-29939 actively exploited?
Active exploitation of CVE-2021-29939 has not been confirmed. Its EPSS score was 1.0% on 2026-09-25, the estimated probability of exploitation in the next 30 days.
What is the CVSS score for CVE-2021-29939?
CVE-2021-29939 has a CVSS v3 base score of 7.3 (HIGH severity).
Is CVE-2021-29939 affecting your environment?
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