How severe is CVE-2023-22839?

CVE-2023-22839 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2023-22839 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (46th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-22839?

CVE-2023-22839 primarily affects F5 Big-ip Domain Name System. In total, 34 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2023-22839?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2023-22839 published?

CVE-2023-22839 was published on 2023-02-01 and last updated on 2026-06-17.

CVE-2023-22839

CVE-2023-22839 is a high-severity vulnerability in F5 Big-ip Domain Name System with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-476.

Key facts

Severity: High (CVSS 3.x base score 7.5)
EPSS exploit prediction: 1% (46th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-476
Affected product: F5 Big-ip Domain Name System
Published: 2023-02-01
Last modified: 2026-06-17

Description

On BIG-IP versions 17.0.x before 17.0.0.2, 16.1.x before 16.1.3.3, 15.1.x before 15.1.8.1, 14.1.x before 14.1.5.3, and all version of 13.1.x, when a DNS profile with the Rapid Response Mode setting enabled is configured on a virtual server with hardware SYN cookies enabled, undisclosed requests cause the Traffic Management Microkernel (TMM) to terminate. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

Frequently asked questions

What is CVE-2023-22839?: On BIG-IP versions 17.0.x before 17.0.0.2, 16.1.x before 16.1.3.3, 15.1.x before 15.1.8.1, 14.1.x before 14.1.5.3, and all version of 13.1.x, when a DNS profile with the Rapid Response Mode setting enabled is configured on a virtual server with hardware SYN cookies enabled, undisclosed requests cause the Traffic Management Microkernel (TMM) to terminate. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.
How severe is CVE-2023-22839?: CVE-2023-22839 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2023-22839 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (46th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-22839?: CVE-2023-22839 primarily affects F5 Big-ip Domain Name System. In total, 34 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2023-22839?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2023-22839 published?: CVE-2023-22839 was published on 2023-02-01 and last updated on 2026-06-17.

References

https://my.f5.com/manage/s/article/K37708118

Affected products (34)

cpe:2.3:a:f5:big-ip_domain_name_system:*:*:*:*:*:*:*:*
cpe:2.3:a:f5:big-ip_local_traffic_manager:*:*:*:*:*:*:*:*
cpe:2.3:o:f5:big-ip_10000s_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:f5:big-ip_10200v_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:f5:big-ip_10200v-ssl_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:f5:big-ip_12000_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:f5:big-ip_5000s_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:f5:big-ip_5200v_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:f5:big-ip_5200v-ssl_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:f5:big-ip_7000s_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:f5:big-ip_7200v_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:f5:big-ip_7200v-ssl_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:f5:big-ip_i10600_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:f5:big-ip_i10800_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:f5:big-ip_i11600_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:f5:big-ip_i11800_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:f5:big-ip_i15600_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:f5:big-ip_i15800_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:f5:big-ip_i5600_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:f5:big-ip_i5800_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:f5:big-ip_i7600_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:f5:big-ip_i7800_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:f5:r10600_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:f5:r10800_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:f5:r10900_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:f5:r5600_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:f5:r5800_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:f5:r5900_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:f5:velos_bx110_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:f5:viprion_b2100_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:f5:viprion_b2150_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:f5:viprion_b2250_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:f5:viprion_b4300_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:f5:viprion_b4450_firmware:-:*:*:*:*:*:*:*

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