What’s Vulnerable › Vulnerabilities

CVE-2023-41253: BIG-IP DNS TSIG Key vulnerability

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2023-10-10 · updated 2026-06-17
• Weakness: CWE-532

Description

When on BIG-IP DNS or BIG-IP LTM enabled with DNS Services License, and a TSIG key is created, it is logged in plaintext in the audit log.  Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

Affected products

• F5 BIG-IP DNS: from 13.1.0 through 14.1.5; from 15.1.0 before 15.1.9; from 16.1.0 before 16.1.4 — fixed in 15.1.9, 16.1.4
• F5 BIG-IP (LTM): from 13.1.0 through 14.1.5; from 15.1.0 before 15.1.9; from 16.1.0 before 16.1.4 — fixed in 15.1.9, 16.1.4

How to fix

Upgrade to a fixed version: F5 BIG-IP DNS 15.1.9, 16.1.4; F5 BIG-IP (LTM) 15.1.9, 16.1.4. Check the vendor advisory for mitigations.

References

• https://my.f5.com/manage/s/article/K98334513
• https://my.f5.com/manage/s/article/K98334513

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