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NVD / CVE Program· CNA GitHub_M

CVE-2023-27477: wasmtime is a fast and secure runtime for WebAssembly.

Noroxi assessment

Priority: Monitor (action score 17/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.62% (FIRST EPSS).
  • Anyone who can reach it over the internet can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: cranelift-codegen (crates.io) 0.91.1, 0.92.1, 0.93.1; wasmtime (crates.io) 4.0.1, 5.0.1, 6.0.1.

Low priority for now. Upgrade to cranelift-codegen (crates.io) 0.91.1, 0.92.1, 0.93.1; wasmtime (crates.io) 4.0.1, 5.0.1, 6.0.1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

wasmtime is a fast and secure runtime for WebAssembly. Wasmtime's code generation backend, Cranelift, has a bug on x86_64 platforms for the WebAssembly `i8x16.select` instruction which will produce the wrong results when the same operand is provided to the instruction and some of the selected indices are greater than 16. There is an off-by-one error in the calculation of the mask to the `pshufb` instruction which causes incorrect results to be returned if lanes are selected from the second vector. This codegen bug has been fixed in Wasmtiem 6.0.1, 5.0.1, and 4.0.1. Users are recommended to upgrade to these updated versions. If upgrading is not an option for you at this time, you can avoid this miscompilation by disabling the Wasm simd proposal. Additionally the bug is only present on x86_64 hosts. Other platforms such as AArch64 and s390x are not affected.

MediumCVSS 4.3 · v3.1—No exploit Fix available
Published
Mar 8, 2023
Updated
Jun 17, 2026
EPSS
0.6% · 49th percentile

Report tools

JSON

Action score

17

Monitor

Low priority for now.

CVSS
17 / 40 · 4.3 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.6%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
4.3
CNA · GitHub_M
3.1
1.2 point gap

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:N

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2023-27477

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
bytecodealliancecranelift-codegen
bytecodealliancewasmtime

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • bytecodealliance cranelift-codegen0.84.0 and later · before 0.91.1
  • bytecodealliance cranelift-codegen0.92.0
  • bytecodealliance cranelift-codegen0.93.0
  • bytecodealliance wasmtime0.37.0 and later · before 4.0.1
  • bytecodealliance wasmtime5.0.0
  • bytecodealliance wasmtime6.0.0

Versions reported by the vendor

Affected version ranges reported by the assigning authority (GitHub_M). Independent of NVD's CPE analysis and usually ahead of it.

  • bytecodealliance wasmtime

    • cranelift-codegen: >= 0.88.0, < 0.91.1, cranelift-codegen: >= 0.92.0, < 0.92.1, cranelift-codegen: >= 0.93.0, < 0.93.1, wasmtime: >= 0.37.0, < 4.0.1, wasmtime: >= 5.0.0, < 5.0.1, wasmtime: >= 6.0.0, < 6.0.1affected

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
crates.iocranelift-codegenfrom 0.88.0 · before 0.91.10.91.1
crates.iocranelift-codegenfrom 0.92.0 · before 0.92.10.92.1
crates.iocranelift-codegenfrom 0.93.0 · before 0.93.10.93.1
crates.iowasmtimefrom 0.0.0-0 · before 4.0.14.0.1
crates.iowasmtimefrom 1.0.0 · before 4.0.14.0.1
crates.iowasmtimefrom 5.0.0 · before 5.0.15.0.1
crates.iowasmtimefrom 6.0.0 · before 6.0.16.0.1

Same product

bytecodealliance: all records

Other highest-scoring records for the same primary product.

  • CVE-2023-26489Guest-controlled out-of-bounds read/write on x86_64 in wasmtime
    39Monitor
  • CVE-2022-31146Use After Free in Wasmtime
    35Monitor
  • CVE-2021-32629Memory access due to code generation flaw in Cranelift module
    35Monitor

Published before and after this one in the same product

  • ← EarlierCVE-2022-31104Jun 27, 2022 · Miscompilation of `i8x16.swizzle` and `select` with v128 inputs in Wasmtime
    23Monitor
  • ← EarlierCVE-2022-31169Jul 22, 2022 · Cranelift vulnerable to miscompilation of constant values in division on AArch64
    30Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
crates.io:cranelift-codegen0.91.1Package registry (OSV)
crates.io:cranelift-codegen0.92.1Package registry (OSV)
crates.io:cranelift-codegen0.93.1Package registry (OSV)
crates.io:wasmtime4.0.1Package registry (OSV)
crates.io:wasmtime5.0.1Package registry (OSV)
crates.io:wasmtime6.0.1Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
none
Integrity
low · data or configuration can be modified
Availability
none
Attack vector
Network
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
Low
Availability impact
None

Weakness class (CWE)

CWE-193 · Off-by-one Error

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (4 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records