CVE-2019-25040
unbound: infinite loop via a compressed name in dname_pkt_copy
Severity
ModerateRed Hat Product Security
CVSS 3.1
Review impact separately from score.
Published · December 11, 2019
Updated · November 22, 2025
Description
A flaw was found in unbound. An infinite loop in dname_pkt_copy function could be triggered by a remote attacker. The highest threat from this vulnerability is to service availability.
Statement
There is no available reproducer or proof of concept for this issue, nor it was ever proven the infinite loop can be triggered in practice. Indeed in the original report this issue was considered one that might not be triggered and for this reason its Impact is Moderate. Upstream has also disputed this CVE.
CVSS score applicability
The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.
Mitigation
No mitigation is specified in collected source.
CVSS / CWE
CVSS 3.1 · 7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE-835 · Loop with Unreachable Exit Condition ('Infinite Loop')