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CVE-2023-33192

Improper handling of NTS cookie length that could crash the ntpd-rs server

HIGH
7.5
CVSS Score
Published: May 27, 2023 at 03:53 AM UTC
Updated: June 17, 2026 at 06:01 AM UTC
2 products affected across 2 vendorsNtpd RsNtpd Rs

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Severity
HIGH7.5
Exploit prediction
EPSS 0.7%
SSVC
No known exploit

Description

ntpd-rs is an NTP implementation written in Rust. ntpd-rs does not validate the length of NTS cookies in received NTP packets to the server. An attacker can crash the server by sending a specially crafted NTP packet containing a cookie shorter than what the server expects. The server also crashes when it is not configured to handle NTS packets. The issue was caused by improper slice indexing. The indexing operations were replaced by safer alternatives that do not crash the ntpd-rs server process but instead properly handle the error condition. A patch was released in version 0.3.3.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Ntpd Rs· Tweedegolfcargo
95%
0.3.0 ≤ v < 0.3.3
Affected range stops below 0.3.3, so it looks safe — our inference, not a vendor statement
Ntpd Rs· Pendulum
60%
v < 0.3.3
Affected range stops below 0.3.3, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (2)

x_refsource_MISCPatch
Source: [email protected]
https://github.com/pendulum-project/ntpd-rs/pull/752
x_refsource_CONFIRMMitigationVendor Advisory
Source: [email protected]
https://github.com/pendulum-project/ntpd-rs/security/advisories/GHSA-qwhm-h7v3-mrjx

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.5HIGHGitHub_M
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-130NVD-CWE-Other

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