CVE-2017-14062

Severity: critical (CVSS 9.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 3.9% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2017-08-31 · updated 2026-06-17
Weakness: CWE-190

Description

Integer overflow in the decode_digit function in puny_decode.c in Libidn2 before 2.0.4 allows remote attackers to cause a denial of service or possibly have unspecified other impact.

Affected products

Debian Linux: 8.0, 9.0, 10.0
GNU Libidn2: before 2.0.4 — fixed in 2.0.4

How to fix

Upgrade to a fixed version: GNU Libidn2 2.0.4. Check the vendor advisory for mitigations.

References

http://www.debian.org/security/2017/dsa-3988
https://gitlab.com/libidn/libidn2/blob/master/NEWS
https://gitlab.com/libidn/libidn2/commit/3284eb342cd0ed1a18786e3fcdf0cdd7e76676bd
https://lists.debian.org/debian-lts-announce/2018/07/msg00040.html
http://www.debian.org/security/2017/dsa-3988
https://gitlab.com/libidn/libidn2/blob/master/NEWS
https://gitlab.com/libidn/libidn2/commit/3284eb342cd0ed1a18786e3fcdf0cdd7e76676bd
https://lists.debian.org/debian-lts-announce/2018/07/msg00040.html

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