CVE-2021-29922
CVSS v3
9.1
CRITICAL
EPSS Score
2.6 %
exploit probability, as of 2026-09-25
CISA KEV
No
known exploited
Exploitation
—
SSVC status
Description
library/std/src/net/parser.rs in Rust before 1.53.0 does not properly consider extraneous zero characters at the beginning of an IP address string, which (in some situations) allows attackers to bypass access control that is based on IP addresses, because of unexpected octal interpretation.
Technical details
- Published
- 2021-08-07
Frequently asked questions
What is CVE-2021-29922?
library/std/src/net/parser.rs in Rust before 1.53.0 does not properly consider extraneous zero characters at the beginning of an IP address string, which (in some situations) allows attackers to bypass access control that is based on IP addresses, because of unexpected octal interpretation.
Is CVE-2021-29922 actively exploited?
Active exploitation of CVE-2021-29922 has not been confirmed. Its EPSS score was 2.6% on 2026-09-25, the estimated probability of exploitation in the next 30 days.
What is the CVSS score for CVE-2021-29922?
CVE-2021-29922 has a CVSS v3 base score of 9.1 (CRITICAL severity).
Is CVE-2021-29922 affecting your environment?
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