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
Trending — 3 sources updated this week
9.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 3%CVSS: 9.8Exploit: NoneExposed: 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
85.4%
KEV
Not listed

Published

April 14, 2021

Last Modified

November 21, 2024

Advisory Details (7)

Auto-updated Jul 6, 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.

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 14× in last 7d / 51× 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.

  1. 2026-07-23 02:00 UTCEG score recompute
  2. 2026-07-22 22:47 UTCEG score recompute
  3. 2026-07-22 14:06 UTCEPSS rescore
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  70. 2026-05-26 18:19 UTCVendor advisory
  71. 2026-05-26 18:19 UTCGHSA enrichment
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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 85.4% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
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.

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