CVE-2025-59088: SSRF (CVSS 8.6)

Description

If kdcproxy receives a request for a realm which does not have server addresses defined in its configuration, by default, it will query SRV records in the DNS zone matching the requested realm name. This creates a server-side request forgery vulnerability, since an attacker could send a request for a realm matching a DNS zone where they created SRV records pointing to arbitrary ports and hostnames (which may resolve to loopback or internal IP addresses). This vulnerability can be exploited to probe internal network topology and firewall rules, perform port scanning, and exfiltrate data. Deployments where the "use_dns" setting is explicitly set to false are not affected.

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CVSS v3.1 Score

8.6

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N

Weakness Type (CWE)

CWE-918 Server-Side Request Forgery (SSRF)

References

Other References

https://access.redhat.com/errata/RHSA-2025:21138 https://access.redhat.com/errata/RHSA-2025:21139 https://access.redhat.com/errata/RHSA-2025:21140 https://access.redhat.com/errata/RHSA-2025:21141 https://access.redhat.com/errata/RHSA-2025:21142 https://access.redhat.com/errata/RHSA-2025:21448 https://access.redhat.com/errata/RHSA-2025:21748 https://access.redhat.com/errata/RHSA-2025:21806 https://access.redhat.com/errata/RHSA-2025:21818 https://access.redhat.com/errata/RHSA-2025:21819

Frequently Asked Questions

What is CVE-2025-59088? +

If kdcproxy receives a request for a realm which does not have server addresses defined in its configuration, by default, it will query SRV records in the DNS zone matching the requested realm name. This creates a server-side request forgery vulnerability, since an attacker could send a request for a realm matching a DNS zone where they created SRV records pointing to arbitrary ports and hostnames (which may resolve to loopback or internal IP addresses). This vulnerability can be exploited to probe internal network topology and firewall rules, perform port scanning, and exfiltrate data. Deployments where the "use_dns" setting is explicitly set to false are not affected. It has a CVSS v3.1 base score of 8.6 (HIGH).

How severe is CVE-2025-59088? +

CVE-2025-59088 has a CVSS v3.1 score of 8.6 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching.

How do I check if I'm vulnerable to CVE-2025-59088? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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