Cyber Resilience

CVE-2023-22839

Memory Safety in F5 Big-Ip Domain Name System 13.1.0 – 13.1.5

Memory Safety
Published
01 February 2023
Modified
21 November 2024
Patch / advisory
View advisory
CVSS Score v3.1 7.5
Click a component to see what it means
Raw vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS Score 0.0063 47th percentile
Risk Priority 59 floored blend · peak EPSS

Summary

CVE-2023-22839 is a high-severity NULL Pointer Dereference (CWE-476) vulnerability in F5 Big-Ip Domain Name System. Its CVSS base score is 7.5 (High).

Operationally, exploitation aligns with the MITRE ATT&CK technique Endpoint Denial of Service (T1499); ranked at the 47th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

OWASP Top 10 for Web (2025)

A10:2025 Mishandling of Exceptional Conditions

EU & UK References

Vulnerability Data

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…

more

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.

CWE(s)
CWE-476

Related Threats

MITRE ATT&CK Enterprise Techniques

T1499 Endpoint Denial of Service Impact
Adversaries may perform Endpoint Denial of Service (DoS) attacks to degrade or block the availability of services to users.
attack.mitre.org →
T1499.004 Application or System Exploitation Impact
Adversaries may exploit software vulnerabilities that can cause an application or system to crash and deny availability to users.
attack.mitre.org →
T1489 Service Stop Impact
Adversaries may stop or disable services on a system to render those services unavailable to legitimate users.
attack.mitre.org →
Derived from this CVE’s CWE(s) via the direct CWE→ATT&CK cross-walk.

CVEs Like This One

CVE-2024-24775Same product: F5 Big-Ip Domain Name System
CVE-2023-22340Same product: F5 Big-Ip Domain Name System
CVE-2025-41433Same product: F5 Big-Ip Domain Name System
CVE-2025-20045Same product: F5 Big-Ip Domain Name System
CVE-2025-52585Same product: F5 Big-Ip Domain Name System
CVE-2024-25560Same product: F5 Big-Ip Domain Name System
CVE-2024-41164Same product: F5 Big-Ip Domain Name System
CVE-2026-42409Same product: F5 Big-Ip Domain Name System
CVE-2025-41414Same product: F5 Big-Ip Domain Name System
CVE-2025-61960Same product class: WAF / load balancer

Affected Assets

f5
big-ip domain name system
13.1.0 — 13.1.5 · 14.1.0 — 14.1.5.3 · 15.1.0 — 15.1.7
f5
big-ip local traffic manager
13.1.0 — 13.1.5 · 14.1.0 — 14.1.5.3 · 15.1.0 — 15.1.7
f5
big-ip 10000s firmware
all versions
f5
big-ip 10200v firmware
all versions
f5
big-ip 10200v-ssl firmware
all versions
f5
big-ip 12000 firmware
all versions
f5
big-ip 5000s firmware
all versions
f5
big-ip 5200v firmware
all versions
f5
big-ip 5200v-ssl firmware
all versions
f5
big-ip 7000s firmware
all versions
+24 more product configuration(s) — see NVD for full list

Mitigating Controls

Mitigating Controls (NIST CSF 2.0) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→CSF cross-walk (authority under review) — links open the control.

PR.PS-06 mostly match
prevents

Secure SDLC practices (static analysis, code review, safe coding standards) directly prevent NULL dereference bugs during development.

Mitigating Controls (ISO/IEC 27001:2022 Annex A) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→ISO cross-walk (authority under review) — links open the control.

A.8.29 Security testing in development and acceptance mostly match
finds

Security testing can detect NULL dereference defects before release.

A.8.25 Secure development life cycle partial match
prevents

Secure SDLC mandates defensive coding practices that can prevent NULL dereferences.

A.8.26 Application security requirements partial match
prevents

Application security requirements can specify input validation and pointer-safety rules.

A.8.27 Secure system architecture and engineering principles partial match
prevents

Secure architecture principles encourage defensive design that avoids unsafe pointer use.

A.8.28 Secure coding partial match
prevents

Secure coding standards directly require NULL-pointer checks and safe dereference patterns.

References