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CVE-2023-6245

21
FAUCET Score

CVE-2023-6245 is a Denial of Service vulnerability affecting the DFINITY Candid library, specifically impacting Rust-based canisters. An attacker can trigger an infinite decoding loop by sending a specially crafted payload containing an 'empty' data type, leading to the canister trapping due to exceeding instruction limits. This vulnerability has a CVSS score of 7.5 (High) due to its network attack vector, low attack complexity, and high availability impact, with no confidentiality or integrity impact. Currently, there is no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
>= 0.9.0, < 0.9.10CPE matchmatch criteria
cpe:2.3:a:dfinity:candid:*:*:*:*:*:rust:*:*

CVSS Data

CVSS version used by this source: 3.1

7.5HIGH

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.21%
Probability of exploitation in next 30 days
EPSS Percentile
65.3%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0121 is in the 44th percentile among its peer group of 51,551 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (2)

github_advisorypatch availablevia nvd_reference
View patch
rustpatch availablevia ghsa
Product: candidFixed in: 0.9.10

Vendor Advisories (1)

rustGHSA-7787-p7x6-fq3jhigh

Candid infinite decoding loop through specially crafted payload

Dec 8, 2023

References

github.com / dfinity/candid/blob/master/spec/Candid.md
Product
github.com / dfinity/candid/pull/478
Patch
github.com / dfinity/candid/security/advisories/GHSA-7787-p7x6-fq3j
PatchThird Party Advisory
internetcomputer.org / docs/current/references/candid-ref
Product
internetcomputer.org / docs/current/references/ic-interface-spec
Product