CVE-2017-13704

high

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.

References

Advisories
More

https://security.googleblog.com/2017/10/behind-masq-yet-more-dns-and-dhcp.html

https://access.redhat.com/security/vulnerabilities/3199382

http://www.securitytracker.com/id/1039474

http://www.securityfocus.com/bid/101085

https://www.synology.com/support/security/Synology_SA_17_59_Dnsmasq

https://www.mail-archive.com/dnsmasq-discuss%40lists.thekelleys.org.uk/msg11665.html

https://www.mail-archive.com/dnsmasq-discuss%40lists.thekelleys.org.uk/msg11664.html

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4TK6DWC53WSU6633EVZL7H4PCWBYHMHK/

https://euvd.enisa.europa.eu/vulnerability/EUVD-2017-5221

https://cert-portal.siemens.com/productcert/pdf/ssa-689071.pdf

http://www.securityfocus.com/bid/101977

http://thekelleys.org.uk/gitweb/?p=dnsmasq.git%3Ba=commit%3Bh=63437ffbb58837b214b4b92cb1c54bc5f3279928

http://thekelleys.org.uk/dnsmasq/CHANGELOG

Details

Source: Mitre, NVD

Published: 2017-10-03

Updated: 2026-06-17

Risk Information

CVSS v2

Base Score: 5

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:P

Severity: Medium

CVSS v3

Base Score: 7.5

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Severity: High

EPSS

EPSS: 0.6541