CVE-2021-29922

CRITICALNVD 9.19.1—
EchelonGraph scoreMEDIUM confidence

Score 9.1 from GitHub Security Advisory (severity: CRITICAL) published 2022-05-24. NVD baseline CVSS 9.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
9.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 3%CVSS: 9.1Exploit: None knownExposed: 0

A fix is available — apply it.

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 v3
9.1
EG Score
9.1(medium)
EG Risk
46(Track)
EG Risk 46/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity91% × 45%
Exploitation3% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
3%
EPSS %ILE
85%
KEV
Not listed

Published

August 7, 2021

Last Modified

November 21, 2024

Advisory Details (6)

Auto-updated Jul 23, 2026
⚠️ Active exploitation confirmed. Patch available. Sources: github_pr, github.
github_pr

Disallow octal format in Ipv4 string

Fix merged in rust-lang/rust PR #83652 on 2021-03-30 — awaiting tagged release

https://github.com/rust-lang/rust/pull/83652
generic

Ipv4Addr: Incorrect Parsing for Octal format IP string · Issue #83648 · rust-lang/rust · GitHub

https://github.com/rust-lang/rust/issues/83648
generic

Ipv4Addr in std::net - Rust

https://doc.rust-lang.org/beta/std/net/struct.Ipv4Addr.html
generic🔴 Active Exploitation

DEF CON® 29 Hacking Conference - Speakers

https://defcon.org/html/defcon-29/dc-29-speakers.html#kaoudis
generic

Rust: Multiple Vulnerabilities (GLSA 202210-09) — Gentoo security

https://security.gentoo.org/glsa/202210-09
github Patch Available🟡 PoC Available

security/advisories/SICK-2021-015.md at master · sickcodes/security · GitHub

https://github.com/sickcodes/security/blob/master/advisories/SICK-2021-015.md

Patch Availability(1)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatrust-toolset:rhel8-8050020210817185544.f73640c02021-11-09redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(10 across 10 ecosystems)
Alpine:v3.19(1)
PackageVulnerable rangeFixed inDependents
rust—1.52.1-r1—
Alpine:v3.20(1)
PackageVulnerable rangeFixed inDependents
rust—1.52.1-r1—
Alpine:v3.21(1)
PackageVulnerable rangeFixed inDependents
rust—1.52.1-r1—
Alpine:v3.22(1)
PackageVulnerable rangeFixed inDependents
rust—1.52.1-r1—
Alpine:v3.23(1)
PackageVulnerable rangeFixed inDependents
rust—1.52.1-r1—
Alpine:v3.24(1)
PackageVulnerable rangeFixed inDependents
rust—1.52.1-r1—
Debian:11(1)
PackageVulnerable rangeFixed inDependents
rustc1.48.0+dfsg1-2 ... 1.96.0+dfsg1-1~exp1 (200 versions)——
Debian:12(1)
PackageVulnerable rangeFixed inDependents
rustc—1.53.0+dfsg1-1—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
rustc—1.53.0+dfsg1-1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
rustc—1.53.0+dfsg1-1—

All Vendor Advisories

(1)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 5× in last 7d / 29× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 163 total refreshes for this CVE.

  1. 2026-09-24 14:00 UTCEPSS rescore
  2. 2026-09-23 13:44 UTCEPSS rescore
  3. 2026-09-21 20:28 UTCEPSS rescore
  4. 2026-09-19 15:37 UTCEPSS rescore
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  15. 2026-09-07 15:58 UTCEPSS rescore
  16. 2026-09-06 13:44 UTCEPSS rescore
  17. 2026-09-06 11:00 UTCOSV refresh
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  1. 2026-08-30 01:19 UTCEPSS rescore
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  8. 2026-08-21 23:46 UTCEPSS rescore
  9. 2026-08-20 22:52 UTCEPSS rescore
  10. 2026-08-19 21:34 UTCOSV refresh
  11. 2026-08-19 17:01 UTCEPSS rescore
  12. 2026-08-18 13:45 UTCEPSS rescore
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  21. 2026-08-08 16:33 UTCEPSS rescore
  22. 2026-08-07 16:23 UTCEPSS rescore
  23. 2026-08-06 13:43 UTCEPSS rescore
  24. 2026-08-05 19:14 UTCEPSS rescore
  25. 2026-08-04 16:57 UTCOSV refresh
  26. 2026-08-04 15:06 UTCEPSS rescore
  27. 2026-08-04 10:34 UTCEPSS rescore
  28. 2026-08-03 10:33 UTCEPSS rescore
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  39. 2026-07-24 14:15 UTCEPSS rescore
  40. 2026-07-23 14:16 UTCEPSS rescore
  41. 2026-07-23 02:00 UTCEG score recompute
  42. 2026-07-22 22:47 UTCEG score recompute
  43. 2026-07-22 14:06 UTCEPSS rescore
  44. 2026-07-22 14:06 UTCEPSS rescore
  45. 2026-07-21 15:22 UTCEPSS rescore
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  47. 2026-07-20 17:05 UTCEPSS rescore
  48. 2026-07-19 14:28 UTCEPSS rescore
  49. 2026-07-19 02:27 UTCEPSS rescore
  50. 2026-07-19 02:27 UTCEPSS rescore
  51. 2026-07-18 14:59 UTCOSV refresh
  52. 2026-07-18 10:02 UTCEPSS rescore
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  54. 2026-07-16 17:00 UTCEPSS rescore
  55. 2026-07-15 16:55 UTCEPSS rescore
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  64. 2026-07-09 19:07 UTCEPSS rescore
  65. 2026-07-08 15:12 UTCEPSS rescore
  66. 2026-07-07 13:43 UTCEPSS rescore
  67. 2026-07-06 16:25 UTCEPSS rescore
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  74. 2026-07-02 16:57 UTCEPSS rescore
  75. 2026-07-01 15:03 UTCEPSS rescore

Related CVEs(same product)

Frequently asked(5)

What is CVE-2021-29922?
CVE-2021-29922 is a critical vulnerability published on August 7, 2021. 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.
When was CVE-2021-29922 disclosed?
CVE-2021-29922 was first published in the National Vulnerability Database on August 7, 2021, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2021-29922 actively exploited?
CVE-2021-29922 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 3% probability of exploitation in the next 30 days, which ranks it in the top 15.2% of all scored CVEs.
What is the CVSS score of CVE-2021-29922?
CVE-2021-29922 has a CVSS v3 base score of 9.1 (NVD).
How do I remediate CVE-2021-29922?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-29922, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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