CVE-2022-24791

HIGHNVD 8.18.1
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to NVD's CVSS score.

Score 8.1 from GitHub Security Advisory (severity: HIGH) published 2022-04-01. NVD baseline CVSS 8.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: EPSS, GitHub Security Advisory, NVD CVSS v3

Also known asEUVD-2022-1747 (ENISA EUVD) · GHSA-gwc9-348x-qwv2 (GitHub Security Advisories) · RUSTSEC-2022-0016 (OSV.dev) · RUSTSEC-2022-0099 (OSV.dev)Source: ENISA EUVD

8.1EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1.2%CVSS: 8.1Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

Wasmtime is a standalone JIT-style runtime for WebAssembly, using Cranelift. There is a use after free vulnerability in Wasmtime when both running Wasm that uses externrefs and enabling epoch interruption in Wasmtime. If you are not explicitly enabling epoch interruption (it is disabled by default) then you are not affected. If you are explicitly disabling the Wasm reference types proposal (it is enabled by default) then you are also not affected. The use after free is caused by Cranelift failing to emit stack maps when there are safepoints inside cold blocks. Cold blocks occur when epoch interruption is enabled. Cold blocks are emitted at the end of compiled functions, and change the order blocks are emitted versus defined. This reordering accidentally caused Cranelift to skip emitting some stack maps because it expected to emit the stack maps in block definition order, rather than block emission order. When Wasmtime would eventually collect garbage, it would fail to find live references on the stack because of the missing stack maps, think that they were unreferenced garbage, and therefore reclaim them. Then after the collection ended, the Wasm code could use the reclaimed-too-early references, which is a use after free. Patches have been released in versions 0.34.2 and 0.35.2, which fix the vulnerability. All Wasmtime users are recommended to upgrade to these patched versions. If upgrading is not an option for you at this time, you can avoid the vulnerability by either: disabling the Wasm reference types proposal, config.wasm_reference_types(false); or by disabling epoch interruption if you were previously enabling it. config.epoch_interruption(false).

CVSS v3
8.1
EG Score
8.1HIGHmedium confidence
EG Risk
37
EG Risk 37/100

EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.

How it’s computed (value × EchelonGraph’s weight)
Severity81% × 45%
Impact severity (EG Severity): CVSS 8.1 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation1.2% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Track* at high (mission-essential systems).
Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
1.2%
EPSS %ILE
68th
KEV
Not listed

What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)

The EG score (8.1): severity, escalated by confirmed exploitation. This CVE's 8.1 is its impact severity (EG Severity), not escalated.

EG Severity
8.1 HIGHCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
EG Likelihood
1.2% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-11-09). FIRST's exploitation probability, not an EchelonGraph model.
Confirmed exploitation
None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
EG Priority
SSVC Track at medium mission impactTrack at low or medium mission impact; Track* at high (mission-essential systems).CISA BOD 26-04: 14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.Each input and its source, and whom BOD 26-04 binds: the SSVC and BOD 26-04 blocks below.

SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Track* at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

The score's inputs: In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

March 31, 2022

Last Modified

November 21, 2024

Advisory Details (2)

Auto-updated Sep 12, 2026
Patch available. Sources: github, github_commit.
GitHub advisoryMentions a patch (unverified)

Use after free with `externref`s and epoch interruption in Wasmtime · Advisory · bytecodealliance/wasmtime · GitHub

https://github.com/bytecodealliance/wasmtime/security/advisories/GHSA-gwc9-348x-qwv2
GitHub commit

commit 666c2554ea0e (bytecodealliance/wasmtime)

Fix landed in bytecodealliance/wasmtime commit 666c2554ea0e — awaiting tagged release

https://github.com/bytecodealliance/wasmtime/commit/666c2554ea0e1728c35aa41178cf235920db888a

Vendor Advisories for CVE-2022-24791(2)

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 / EcosystemFix (by version range) / PatchReleasedSource
rustwasmtime @ 0.34.2 (fixes < 0.34.2)—ghsa
rustwasmtime @ 0.35.2 (fixes >= 0.35.0, < 0.35.2)—ghsa

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

(1 across 1 ecosystem)
crates.io(1)
PackageVulnerable rangeFix by version rangeDependents
wasmtime—
  • every version up to 0.34.2: fixed in 0.34.2
  • 0.35.0 up to 0.35.2: fixed in 0.35.2
  • 0.34.0 up to 0.34.2: fixed in 0.34.2
  • 0.0.0-0 up to 0.34.2: fixed in 0.34.2
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 8× in last 7d / 34× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed its CVE.org record (CNA or CISA ADP). An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). "EchelonGraph re-scored" is our own recompute of this CVE's score, not an update from a source, and is not counted in the refreshes above. Most recent first.

Showing the most recent 100 of 214 rows on record for this CVE, as 98 entries (2 repeats merged).

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. 2 repeat rows among the latest 100 are merged into the row they repeat. The 114 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-11-13 16:41 UTCEPSS rescoreEPSS 1.2% · 68th percentile
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  5. 2026-11-10 04:27 UTCEchelonGraph re-scored
  6. 2026-11-10 04:27 UTCGHSA enrichmentGHSA-gwc9-348x-qwv2 · GitHub severity HIGH · GitHub CVSS 8.1
  7. 2026-11-09 16:29 UTCEPSS rescoreEPSS 1.2% · 67th percentile
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  13. 2026-11-03 17:22 UTCEchelonGraph re-scored
  14. 2026-11-03 17:22 UTCGHSA enrichmentGHSA-gwc9-348x-qwv2 · GitHub severity HIGH · GitHub CVSS 8.1
  15. 2026-11-03 16:39 UTCEPSS rescoreEPSS 1.2% · 67th percentile
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  17. 2026-11-01 16:30 UTCEPSS rescoreEPSS 1.2% · 67th percentile
  18. 2026-11-01 08:28 UTCGHSA enrichmentGHSA-gwc9-348x-qwv2 · GitHub severity HIGH · GitHub CVSS 8.1
  19. 2026-11-01 08:28 UTCEchelonGraph re-scored
  20. 2026-10-31 16:29 UTCEPSS rescoreEPSS 1.2% · 67th percentile
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  24. 2026-10-28 04:57 UTCEchelonGraph re-scored
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  1. 2026-10-26 16:28 UTCEPSS rescoreEPSS 1.2% · 67th percentile
  2. 2026-10-25 18:12 UTCEchelonGraph re-scored
  3. 2026-10-25 16:29 UTCEPSS rescoreEPSS 1.2% · 67th percentile
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  8. 2026-10-21 07:49 UTCEchelonGraph re-scored
  9. 2026-10-20 16:29 UTCEPSS rescoreEPSS 1.2% · 67th percentile
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  12. 2026-10-18 08:41 UTCEchelonGraph re-scored
  13. 2026-10-17 16:29 UTCEPSS rescoreEPSS 1.2% · 67th percentile
  14. 2026-10-16 23:54 UTCOSV refresh
  15. 2026-10-16 16:34 UTCEPSS rescoreEPSS 1.2% · 67th percentile
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  19. 2026-10-12 18:58 UTCEchelonGraph re-scored
  20. 2026-10-12 16:30 UTCEPSS rescoreEPSS 1.2% · 66th percentile
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  22. 2026-10-11 13:44 UTCEPSS rescoreEPSS 1.2% · 66th percentile
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  32. 2026-09-30 15:00 UTCEPSS rescoreEPSS 1.2% · 66th percentile
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Frequently asked(5)

What is CVE-2022-24791?
CVE-2022-24791 is a high-severity vulnerability; its CVE record was published on March 31, 2022. Wasmtime is a standalone JIT-style runtime for WebAssembly, using Cranelift. There is a use after free vulnerability in Wasmtime when both running Wasm that uses externrefs and enabling epoch interruption in Wasmtime. If you are not explicitly enabling epoch interruption (it is disabled by default)…
When was the CVE record for CVE-2022-24791 published?
The CVE record for CVE-2022-24791 was published on March 31, 2022. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of November 21, 2024; the record at its source may have been updated since.
Is CVE-2022-24791 actively exploited?
CVE-2022-24791 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1.2% probability of exploitation in the next 30 days (68th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2022-24791?
CVE-2022-24791 has a CVSS v3 base score of 8.1 (NVD).
How do I remediate CVE-2022-24791?
A fix for CVE-2022-24791 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2022-24791 are linked in the Vendor Advisories panel on this page.

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