Bug 1954796 (CVE-2019-25038) - CVE-2019-25038 unbound: integer overflow in a size calculation in dnscrypt/dnscrypt.c
Summary: CVE-2019-25038 unbound: integer overflow in a size calculation in dnscrypt/dn...
Alias: CVE-2019-25038
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 1968663 1968664 1859933
Blocks: 1954811
TreeView+ depends on / blocked
Reported: 2021-04-28 19:06 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 integer overflow in dnsc_load_local_data function may lead to a buffer overflow of the allocated buffer if the size can be controlled by an attacker. The highest threat from this vulnerability is to data confidentiality and integrity as well as service availability.
Clone Of:
Last Closed: 2021-05-18 20:39:10 UTC

Attachments (Terms of Use)

Description Guilherme de Almeida Suckevicz 2021-04-28 19:06:22 UTC
Unbound before 1.9.5 allows an integer overflow in a size calculation in dnscrypt/dnscrypt.c.


Comment 3 Riccardo Schirone 2021-05-06 14:53:13 UTC

There is no available reproducer or proof of concept for this issue, nor it was ever proven the integer overflow can lead to a buffer overflow 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 15:37:48 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 20:39:10 UTC
This bug is now closed. Further updates for individual products will be reflected on the CVE page(s):


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