DoS Vulnerability in ntpd-rs

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS

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

EPSS

• CVE-2025-58066: 0.33% estimated exploitation activity in the next 30 days; percentile 26.55 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

Summary A denial of service vulnerability was discovered in ntpd-rs where an attacker can induce a message storm between two NTP servers running ntpd-rs. Details Since ntpd-rs version 1.2.0, when configured as a server, incorrectly responded to all NTP messages sent to the server's port with a time reply, including to responses from other servers. As a consequence, a message with a spoofed IP address of another server could cause two servers running ntpd-rs to continually respond to each other, consuming significant amounts of resources. Impact Any time server running ntpd-rs with version between 1.2.0 and 1.6.1 inclusive which allows non-NTS traffic is affected. Client-only configurations are not affected. Affected users are recommended to upgrade to version 1.6.2 as soon as possible. Workarounds Should upgrading not be possible, the impact of the issue can be mitigated by: - Whitelisting access to only IP addresses of clients using the server, using the ignore filter method. -…

Published by the source

29 Aug 2025, 20:07 UTC

Last modified by the source

29 Aug 2025, 21:59 UTC

Source last checked

26 Oct 2026, 15:39 UTC

1. Revision 1 · created · 26 Oct 2026

   Published from ghsa record GHSA-4855-q42w-5vr4

Preview the exact text before you copy it. Commands are read-only suggestions; review them before running anything.

# Patch Next advisory brief: CVE-2025-58066

Advisory: DoS Vulnerability in ntpd-rs
IDs: CVE-2025-58066, GHSA-4855-q42w-5vr4
Record: https://patchnext.com/advisories/cve-2025-58066 (revision 1, source checked 26 Oct 2026, 15:39 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 5.3)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: ntpd-rs 1.6.2. A vendor fix does not mean a deployment is fixed.

## Affected components
- crates.io ntpd-rs: affected >= 1.2.0, < 1.6.2; fixed in 1.6.2

## Suggested inspection (read-only)
- crates.io ntpd-rs: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on ntpd-rs.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-4855-q42w-5vr4 (GitHub-reviewed advisory GHSA-4855-q42w-5vr4 lists affected ranges: crates.io ntpd-rs >=1.2.0 <1.6.2)

Commands are suggestions: review each one before running it.