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No exploitation reportedFix available

CVE-2021-29922

No exploitation reported by the sources we read.

  • Published2021-08-07
  • Fixed in1.53.0

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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.

Timeline

dates in UTC
  1. 2021-08-0717:15CVE publishedNVD

Versions per branch

NVD
Rust-lang rust
BranchAffectedFixed in
1.53< 1.53.01.53.0

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • rustRocky Linux:8all versions · fixed in 0:1.54.0-2.module+el8.5.0+678+cf7bc64b
  • rustRed Hat:enterprise_linux:8::appstreamall versions · fixed in 0:1.54.0-2.module+el8.5.0+12254+dc27bae9and 19 other packages
  • rustopenEuler:20.03-LTS-SP2all versions · fixed in 1.51.0-5.oe1
  • rustopenEuler:20.03-LTS-SP1all versions · fixed in 1.51.0-5.oe1
  • rustCleanStartall versions · fixed in 1.52.1-r1
  • rustAlpine:v3.24all versions · fixed in 1.52.1-r1and 1 other package
  • rustAlpine:v3.23all versions · fixed in 1.52.1-r1
  • rustAlpine:v3.22all versions · fixed in 1.52.1-r1

18 more package ranges on OSV.dev

Vendor advisories

  • CVE-2021-29922 Red Hat Product Security70 products fixed

    rust: incorrect parsing of extraneous zero characters at the beginning of an IP address string

  • RHSA-2021:4270 Red Hat Product Security70 products fixed

    Red Hat Security Advisory: rust-toolset:rhel8 security, bug fix, and enhancement update

Full record on NVD

Fix

  1. Update Rust-lang rust to 1.53.0
  2. Vendor fix Red Hat Product Security RHSA-2021:4270 · 70 productsFor details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
  3. Workaround from the vendor Red Hat Product Security RHSA-2021:4270 · 70 productsMitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
Published
2021-08-07
Last Modified
2026-06-17
NVD status
Modified
GitHub Advisory
GHSA-g9v3-gh27-qjh3

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 2.5% on 2026-11-08, 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), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H.

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