Out of Bounds Slice index in cfnts leads to remote panic
Priority MEDIUM 48CWE-119Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-119 and the CVSS impact.
Summary
An unchecked read in NTP server in github.com/cloudflare/cfnts prior to commit 783490b https://github.com/cloudflare/cfnts/commit/783490b913f05e508a492cd7b02e3c4ec2297b71 enabled a remote attacker to trigger a panic by sending an NTSAuthenticator packet with extension length longer than the packet contents.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.02237 82nd percentileScored 2026-11-07
Fix Fixed No fixed version in the sources yet
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- Yes
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
No affected products listed by the sources yet.
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:cloudflare:cfnts:*:*:*:*:*:rust:*:* | before 2023-06-01 | Vulnerable | Cloudflare |
- cpe:2.3:a:cloudflare:cfnts:*:*:*:*:*:rust:*:* Versions before 2023-06-01 Vulnerable ·Cloudflare
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2023-3036
Sources
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences