CVE-2017-13704

high

Published 2017-10-03 · Modified 2026-05-13

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CVSS v3

7.5

CVSS:3.0/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

In dnsmasq before 2.78, if the DNS packet size does not match the expected size, the size parameter in a memset call gets a negative value. As it is an unsigned value, memset ends up writing up to 0xffffffff zero's (0xffffffffffffffff in 64 bit platforms), making dnsmasq crash.

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

OS	Version	Status	Fixed in
debian	bookworm	fixed	`2.78-1`
debian	bullseye	fixed	`2.78-1`
debian	forky	fixed	`2.78-1`
debian	sid	fixed	`2.78-1`
debian	trixie	fixed	`2.78-1`
ubuntu	14.04	affected
ubuntu	16.04	affected
ubuntu	17.04	affected
debian	7.0	affected
debian	7.1	affected
debian	9.0	affected
fedora	27	affected
rhel	7.0	affected

Application impact

Vendor	Product	Versions	Fixed
thekelleys	dnsmasq	`{"endIncluding":"2.77"}`

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.