← Vulnerability feed

Vulnerability record · CVE-2021-29922 · published 7 August 2021

CVE-2021-29922: Rust-lang rust vulnerability

Rust Lang · Rust

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.

9.1 CVSS 3.1 Critical EPSS 2.6% · top 15.1%
9.1CVSS 3.1 base score, v2 6.4
2.6%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
12References, 4 tagged exploit
17 Jun 2026Last modified by NVD

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://defcon.org/html/defcon-29/dc-29-speakers.html#kaoudis Third Party Advisory
https://doc.rust-lang.org/beta/std/net/struct.Ipv4Addr.html Vendor Advisory
https://github.com/rust-lang/rust/issues/83648 ExploitIssue TrackingPatchThird Party Advisory
https://github.com/rust-lang/rust/pull/83652 PatchThird Party Advisory
https://github.com/sickcodes/security/blob/master/advisories/SICK-2021-015.md ExploitThird Party Advisory
https://security.gentoo.org/glsa/202210-09 Third Party Advisory
https://defcon.org/html/defcon-29/dc-29-speakers.html#kaoudis Third Party Advisory
https://doc.rust-lang.org/beta/std/net/struct.Ipv4Addr.html Vendor Advisory
https://github.com/rust-lang/rust/issues/83648 ExploitIssue TrackingPatchThird Party Advisory
https://github.com/rust-lang/rust/pull/83652 PatchThird Party Advisory
https://github.com/sickcodes/security/blob/master/advisories/SICK-2021-015.md ExploitThird Party Advisory
https://security.gentoo.org/glsa/202210-09 Third Party Advisory

Track CVE-2021-29922 inside VULONE

Watch it alongside the ransomware crews, C2 infrastructure and forum chatter that reference it, query it through the API and pull it into your SIEM over TAXII.

Start free Open in platform

Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

10.0CVE-2024-24576Fedoraproject fedora os command injection vulnerabilityRust is a programming language. The Rust Security Response WG was notified that the Rust standard library prior to version 1.77.2 did not properly es…EPSS 20%9.8CVE-2024-3566Haskell process library command injection vulnerabilityA command inject vulnerability allows an attacker to perform command injection on Windows applications that indirectly depend on the CreateProcess fu…EPSS 6.9%9.8CVE-2021-31162Rust-lang rust double free vulnerabilityIn the standard library in Rust before 1.52.0, a double free can occur in the Vec::from_iter function if freeing the element panics.EPSS 2.9%9.8CVE-2020-36318Rust-lang rust double free vulnerabilityIn the standard library in Rust before 1.49.0, VecDeque::make_contiguous has a bug that pops the same element more than once under certain condition.…EPSS 1.7%9.8CVE-2021-28879Rust-lang rust integer overflow vulnerabilityIn the standard library in Rust before 1.52.0, the Zip implementation can report an incorrect size due to an integer overflow. This bug can lead to a…EPSS 2.4%9.8CVE-2018-1000810Rust-lang rust integer overflow vulnerabilityThe Rust Programming Language Standard Library version 1.29.0, 1.28.0, 1.27.2, 1.27.1, 127.0, 126.2, 126.1, 126.0 contains a CWE-680: Integer Overflo…EPSS 3.0%8.8CVE-2024-43402Rust-lang rust os command injection vulnerabilityRust is a programming language. The fix for CVE-2024-24576, where `std::process::Command` incorrectly escaped arguments when invoking batch files on …EPSS 0.74%8.2CVE-2020-36323Rust-lang rust vulnerabilityIn the standard library in Rust before 1.52.0, there is an optimization for joining strings that can cause uninitialized bytes to be exposed (or the …EPSS 2.0%

Source: NIST National Vulnerability Database (record CVE-2021-29922), CISA KEV, FIRST EPSS (scores of 2026-09-28). This page is refreshed as NVD updates the record.