CVE-2021-29922
CRITICAL
9.1
CVSS Score
Published: August 7, 2021 at 12:00 AM UTC
Updated: June 17, 2026 at 03:48 AM UTC
1 product affected across 1 vendorRust
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Severity
CRITICAL9.1
Exploit prediction
EPSS 3%
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.
Affected
Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.
v < 1.53.0
Affected range stops below 1.53.0, so it looks safe — our inference, not a vendor statement
Remediation
No guide yetNo remediation guidance has been written for this CVE yet. What the record does show:
References (6)
x_refsource_MISCThird Party Advisory
Source: [email protected]
https://defcon.org/html/defcon-29/dc-29-speakers.html#kaoudisExploitIssue TrackingPatchThird Party Advisory
Source: [email protected]
https://github.com/rust-lang/rust/issues/83648ExploitThird Party Advisory
Source: [email protected]
https://github.com/sickcodes/security/blob/master/advisories/SICK-2021-015.mdVendor AdvisoryThird Party Advisory
Source: [email protected]
https://security.gentoo.org/glsa/202210-09CVSS
- Attack Vector
- NETWORK
- Complexity
- LOW
- Privileges
- NONE
- User Interaction
- NONE
- Scope
- UNCHANGED
- Confidentiality
- NONE
- Integrity
- HIGH
- Availability
- HIGH
Vector?
Quick Info
StatusMODIFIED
CWE
NVD-CWE-noinfo
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