CVE-2019-16866

high
Published — · Modified —
CVSS v3
CVSS v2
VIR risk
8.0

Description

Unbound before 1.9.4 accesses uninitialized memory, which allows remote attackers to trigger a crash via a crafted NOTIFY query. The source IP address of the query must match an access-control rule.

Predictions

Exploit likelihood
20%
Patch ETA

Heuristic predictions, AS-IS, for prioritization only.

Mitigations

vendor Authored 2026-05-27

Vendor advisory: debian — https://security-tracker.debian.org/tracker/CVE-2019-16866

vendor Authored 2026-05-27

Vendor advisory: arch — https://security.archlinux.org/ASA-201910-6

OS impact

OSVersionStatusFixed in
arch archfixed1.9.4-1
debian debianbookwormfixed1.9.4-1
debian debianbullseyefixed1.9.4-1
debian debianforkyfixed1.9.4-1
debian debiansidfixed1.9.4-1
debian debiantrixiefixed1.9.4-1

References

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