CVE-2021-31162

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2022-05-24. NVD baseline CVSS 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 3%CVSS: 9.8Exploit: None knownExposed: 0

A fix is available — apply it.

In 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.

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
50(Track)
EG Risk 50/100SSVC: 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
Severity98% × 45%
Exploitation3% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
3%
EPSS %ILE
86%
KEV
Not listed

Published

April 14, 2021

Last Modified

November 21, 2024

Advisory Details (7)

Auto-updated Sep 19, 2026
Upstream fix merged — awaiting tagged release. Sources: github_pr.
github_pr

[beta] backports

Fix merged in rust-lang/rust PR #84603 on 2021-04-27 — awaiting tagged release

https://github.com/rust-lang/rust/pull/84603
github_pr

Fix double-drop in `Vec::from_iter(vec.into_iter())` specialization when items drop during panic

Upstream fix in progress (PR #83629 · rust-lang/rust, state=closed)

https://github.com/rust-lang/rust/pull/83629
generic

Double free in Vec::from_iter specialization when drop panics · Issue #83618 · rust-lang/rust · GitHub

https://github.com/rust-lang/rust/issues/83618
generic

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

https://security.gentoo.org/glsa/202210-09
generic

[SECURITY] Fedora 33 Update: rust-1.51.0-3.fc33 - package-announce - Fedora mailing-lists

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VZG65GUW6Z2CYOQHF7T3TB5CZKIX6ZJE/
generic

[SECURITY] Fedora 32 Update: rust-1.51.0-3.fc32 - package-announce - Fedora mailing-lists

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TFUO3URYCO73D2Q4WYJBWAMJWGGVXQO4/
generic

[SECURITY] Fedora 34 Update: rust-1.51.0-3.fc34 - package-announce - Fedora mailing-lists

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/CZ337CM4GFJLRDFVQCGC7J25V65JXOG5/

Vendor Advisories for CVE-2021-31162(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(2)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatrust-toolset-1.52-rust-0:1.52.1-2.el7_92021-08-10redhat
redhatrust-toolset:rhel8-8040020210603202531.2daa1a952021-08-10redhat

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—1.51.0-r2—
Alpine:v3.20(1)
PackageVulnerable rangeFixed inDependents
rust—1.51.0-r2—
Alpine:v3.21(1)
PackageVulnerable rangeFixed inDependents
rust—1.51.0-r2—
Alpine:v3.22(1)
PackageVulnerable rangeFixed inDependents
rust—1.51.0-r2—
Alpine:v3.23(1)
PackageVulnerable rangeFixed inDependents
rust—1.51.0-r2—
Alpine:v3.24(1)
PackageVulnerable rangeFixed inDependents
rust—1.51.0-r2—
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—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Additional Vendor Advisories

(2)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 8× in last 7d / 32× 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 162 total refreshes for this CVE.

  1. 2026-09-19 15:37 UTCEPSS rescore
  2. 2026-09-18 19:23 UTCEPSS rescore
  3. 2026-09-17 19:23 UTCEPSS rescore
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  14. 2026-09-06 18:43 UTCOSV refresh
  15. 2026-09-06 13:44 UTCEPSS rescore
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  1. 2026-08-27 14:22 UTCEPSS rescore
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  6. 2026-08-21 23:46 UTCEPSS rescore
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  8. 2026-08-20 05:04 UTCOSV refresh
  9. 2026-08-19 17:01 UTCEPSS rescore
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  19. 2026-08-08 16:33 UTCEPSS rescore
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  21. 2026-08-06 13:43 UTCEPSS rescore
  22. 2026-08-05 19:14 UTCEPSS rescore
  23. 2026-08-05 00:10 UTCOSV refresh
  24. 2026-08-04 15:06 UTCEPSS rescore
  25. 2026-08-04 10:34 UTCEPSS rescore
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  39. 2026-07-23 02:00 UTCEG score recompute
  40. 2026-07-22 22:47 UTCEG score recompute
  41. 2026-07-22 14:06 UTCEPSS rescore
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  43. 2026-07-21 15:22 UTCEPSS rescore
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  45. 2026-07-20 17:05 UTCEPSS rescore
  46. 2026-07-19 14:28 UTCEPSS rescore
  47. 2026-07-19 02:27 UTCEPSS rescore
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  49. 2026-07-18 22:29 UTCOSV refresh
  50. 2026-07-18 10:02 UTCEPSS rescore
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  63. 2026-07-09 19:07 UTCEPSS rescore
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  65. 2026-07-07 13:43 UTCEPSS rescore
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  73. 2026-07-02 16:57 UTCEPSS rescore
  74. 2026-07-01 15:03 UTCEPSS rescore
  75. 2026-07-01 05:18 UTCOSV refresh

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2021-31162?
CVE-2021-31162 is a critical vulnerability published on April 14, 2021. In 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.
When was CVE-2021-31162 disclosed?
CVE-2021-31162 was first published in the National Vulnerability Database on April 14, 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-2021-31162 actively exploited?
CVE-2021-31162 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 13.7% of all scored CVEs.
What is the CVSS score of CVE-2021-31162?
CVE-2021-31162 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2021-31162?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-31162, 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

See which npm, PyPI, Go, and Maven packages are affected by CVE-2021-31162

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