Bug 1954799 (CVE-2019-25040) - CVE-2019-25040 unbound: infinite loop via a compressed name in dname_pkt_copy
Summary: CVE-2019-25040 unbound: infinite loop via a compressed name in dname_pkt_copy
Alias: CVE-2019-25040
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
Depends On: 1968662 1859933 1968663 1968664
Blocks: 1954811
TreeView+ depends on / blocked
Reported: 2021-04-28 19:09 UTC by Guilherme de Almeida Suckevicz
Modified: 2021-06-14 07:14 UTC (History)
5 users (show)

Fixed In Version: unbound 1.9.6
Doc Type: If docs needed, set a value
Doc Text:
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.
Clone Of:
Last Closed: 2021-05-18 20:39:15 UTC

Attachments (Terms of Use)

Description Guilherme de Almeida Suckevicz 2021-04-28 19:09:09 UTC
Unbound before 1.9.5 allows an infinite loop via a compressed name in dname_pkt_copy.


Comment 3 Riccardo Schirone 2021-05-06 14:55:30 UTC

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.

Comment 5 errata-xmlrpc 2021-05-18 15:37:53 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2021:1853 https://access.redhat.com/errata/RHSA-2021:1853

Comment 6 Product Security DevOps Team 2021-05-18 20:39:15 UTC
This bug is now closed. Further updates for individual products will be reflected on the CVE page(s):


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