CVE-2023-41045: low-severity vulnerability in graylog2-server
Insecure source port usage for DNS queries in Graylog
Published · Updated
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8Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 3.7epss 0.4%
Graylog is a free and open log management platform. Graylog makes use of only one single source port for DNS queries. Graylog binds a single socket for outgoing DNS queries and while that socket is bound to a random port number it is never changed again. This goes against recommended practice since 2008, when Dan Kaminsky discovered how easy is to carry out DNS cache poisoning attacks. In order to prevent cache poisoning with spoofed DNS responses, it is necessary to maximise the uncertainty in the choice of a source port for a DNS query. Although unlikely in many setups, an external attacker could inject forged DNS responses into a Graylog's lookup table cache. In order to prevent this, it is at least recommendable to distribute the DNS queries through a pool of distinct sockets, each of them with a random source port and renew them periodically. This issue has been addressed in versions 5.0.9 and 5.1.3. Users are advised to upgrade. There are no known workarounds for this issue.
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
Affected products
Graylog2 · graylog2-serverRelated CVEs — graylog2-server
In the same product, most dangerous first.
CVE-2024-24824HIGHgraylog2-server vulnerable to instantiation of arbitrary classes triggered by API requestEPSS 34.7%CVE-2023-41044LOWPartial path traversal vulnerability in Support Bundle feature of GraylogEPSS 0.7%CVE-2026-55841HIGHGraylog: Fortigate syslog message parser can be exploited to modify or delete fields from the original messageEPSS 0.6%CVE-2024-52506HIGHGraylog can leak other users' reports via concurrent PDF report renderingEPSS 0.6%CVE-2025-53106HIGHGraylog vulnerable to privilege escalation through API tokensEPSS 0.6%CVE-2026-55867MEDIUMGraylog token revocation endpoint allows authenticated users to delete other users’ access tokensEPSS 0.6%