CVE-2015-7691

high

Published 2017-08-07 · Modified 2026-05-13

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CVSS v3

7.5

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

CVSS v4 NEW

—

not yet in upstream

VIR risk

7.5

Description

The crypto_xmit function in ntpd in NTP 4.2.x before 4.2.8p4, and 4.3.x before 4.3.77 allows remote attackers to cause a denial of service (crash) via crafted packets containing particular autokey operations. NOTE: This vulnerability exists due to an incomplete fix for CVE-2014-9750.

Predictions

Exploit likelihood

83%

Patch ETA

—

Heuristic predictions, AS-IS, for prioritization only.

Mitigations

No mitigations published for this CVE yet.

The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.

✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here with source_tier=community-verified.

OS impact

Red Hat Affected 2 releases

Version	Status	Fixed in
7.0	Affected	—
6.0	Affected	—

Debian Mixed 4 releases

Version	Status	Fixed in
bullseye	Fixed	`1:4.2.8p4+dfsg-1`
9.0	Affected	—
8.0	Affected	—
7.0	Affected	—

Application impact

Vendor	Product	Versions	Fixed
ntp	ntp	`{"startIncluding":"4.2.0","endExcluding":"4.2.8"}`	`4.2.8`
ntp	ntp	`4.2.8`
netapp	oncommand_performance_manager	`-`
netapp	oncommand_unified_manager	`-`

References

CWEs

CWE-20

Community-verified mitigations for this CVE will appear above when contributors publish them.

Verify integrity in audit chain (admin only). AS-IS.