CVE-2023-3036

Name: CVE-2023-3036
Creator: NVD / NIST
Published: 2023-06-14T12:15:09.647+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 2.24%

Last modified Jun 17, 2026

CVE-2023-3036 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. 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. . EPSS estimates a 2.24% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.1

7.5/10

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

EPSS Probability

2.24%

80.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Cloudflare	Cfnts	< 2023-06-01

References

https://github.com/cloudflare/cfnts/security/advisories/GHSA-pwx6-gw47-96cpPatch, Third Party Advisory
https://github.com/cloudflare/cfnts/security/advisories/GHSA-pwx6-gw47-96cpPatch, Third Party Advisory

Timeline

Published: Jun 14, 2023
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2023-3036?

How severe is CVE-2023-3036?

CVE-2023-3036 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 2.24% probability of exploitation in the next 30 days.

How do I fix CVE-2023-3036?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2023-3036?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST