CVE-2021-44732

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2021-12-21. 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.

Mbed TLS before 3.0.1 has a double free in certain out-of-memory conditions, as demonstrated by an mbedtls_ssl_set_session() failure.

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
83.5%
KEV
Not listed

Published

December 20, 2021

Last Modified

June 5, 2026

Advisory Details (6)

Auto-updated Jun 20, 2026
Patch available. Sources: github_release.
github_release Patch Available

Mbed TLS 2.16.12

Patch available: ARMmbed/mbedtls v2.16.12

https://github.com/ARMmbed/mbedtls/releases/tag/v2.16.12
generic

Releases · Mbed-TLS/mbedtls · GitHub

https://github.com/ARMmbed/mbedtls/releases
generic

829660 – (CVE-2021-43666, CVE-2021-44732, CVE-2021-45450) <net-libs/mbedtls-{2.16.12,2.28.0}: multiple vulnerabilities

https://bugs.gentoo.org/829660
generic Patch Available

[SECURITY] [DLA 3249-1] mbedtls security update

https://lists.debian.org/debian-lts-announce/2022/12/msg00036.html
github_release Patch Available

Mbed TLS 3.1.0

Patch available: ARMmbed/mbedtls v3.1.0

https://github.com/ARMmbed/mbedtls/releases/tag/v3.1.0
github_release Patch Available

Mbed TLS 2.28.0

Patch available: ARMmbed/mbedtls v2.28.0

https://github.com/ARMmbed/mbedtls/releases/tag/v2.28.0

Patch Availability(1)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulibmbedx509-1t64 (2.28.8-1ubuntu0.1~esm1) @ noble2026-05-26ubuntu

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.

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 13× 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.

Showing the most recent 100 of 107 total refreshes for this CVE.

  1. 2026-07-23 02:05 UTCEG score recompute
  2. 2026-07-22 22:52 UTCEG score recompute
  3. 2026-07-22 14:06 UTCEPSS rescore
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  45. 2026-06-12 14:40 UTCOSV refresh
  46. 2026-06-11 13:58 UTCEPSS rescore
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Frequently asked(5)

What is CVE-2021-44732?
CVE-2021-44732 is a critical vulnerability published on December 20, 2021. Mbed TLS before 3.0.1 has a double free in certain out-of-memory conditions, as demonstrated by an mbedtlssslset_session() failure.
When was CVE-2021-44732 disclosed?
CVE-2021-44732 was first published in the National Vulnerability Database on December 20, 2021, with the most recent update on June 5, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2021-44732 actively exploited?
CVE-2021-44732 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 83.5% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2021-44732?
CVE-2021-44732 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2021-44732?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-44732, 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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