CVE-2023-22839 — BIG-IP DNS profile vulnerability

Triage

Is it exploited, how likely is exploitation, what does it touch, and how severe do the sources call it.

CISA SSVC assessment CISA

Three decision points CISA publishes for the CVEs it assesses (SSVC 2.0.3). A stakeholder decision, not a severity score.

Remediation

Fixes and mitigations documented by the sources — linked to the original advisory.

No fix documented by the sources we poll. That does not mean none exists: check the vendor advisory.

First 24 hours

Ordered from the record’s own fields — exposure first, because you cannot patch what you have not found. A rule-generated starting point.

1. Identify exposed assets running the affected vendor/product/version combinations (F5 BIG-IP, F5 Big-ip 10000s Firmware, F5 Big-ip 10200v Firmware…).
2. The attack is network-based and needs no privileges: restrict exposure (ACLs, VPN, WAF) until patched.
3. No fix documented in the sources: reduce exposure and monitor the vendor advisory.
4. Search available logs for exploit probes matching the vulnerability class (memory corruption), errors and authentication anomalies.

Affected scope

Vendor, product and versions as the sources word them.

Attack characteristics

The CVSS vector, decoded. It describes the attack, not your exposure to it.

Every base score collected

Sources score independently and may disagree; each row says who scored it and under which version.

Weakness MITRE

Weakness class according to MITRE’s CWE catalog.

CWE-476 · NULL Pointer Dereference

Other CVEs with this weakness →

EPSS over time FIRST

Oct 28, 2026 → Oct 29, 2026 · 2 reading(s) · max 0.63%

Detection

Read off the CVSS vector and the weakness class. Starting points, not tested rules.

• Prioritize edge telemetry for the network-reachable component (proxy, WAF, IDS/IPS).
• Correlate service crashes/restarts with inbound traffic; repeated crashes may indicate attempts.

Timeline

What happened to this CVE, newest first.

• 2026
• Affected products added · f5/big-ip
  Oct 28, 2026 · CVE Program (cve.org) e CISA ADP
• SSVC assessment updated
  Oct 28, 2026 · CVE Program (cve.org) e CISA ADP
• Record published
  Oct 28, 2026
• CVSS changed · 7.5
  Oct 28, 2026 · NIST National Vulnerability Database
• Source status changed · → Modified
  Oct 28, 2026 · NIST National Vulnerability Database
• Record created in this database
  Oct 28, 2026 · NIST National Vulnerability Database
• 2023
• CVE published
  Feb 1, 2023 · f5

Source activity

Repeated readings are counted rather than listed.

• 1× References added · Oct 28, 2026 – Oct 28, 2026
• 1× Official description updated · Oct 28, 2026 – Oct 28, 2026

References

3 on the record

• my.f5.com/manage/s/article/K37708118
  Vendor Advisory, NIST National Vulnerability Database
• nvd.nist.gov/vuln/detail/CVE-2023-22839
  GitHub Security Advisories
• github.com/advisories/GHSA-9mj7-f2wr-hjrv
  GitHub Security Advisories

Elsewhere on this site

Related CVEs (same products)

• Critical CVE-2026-94127 F5 BIG-IP APM Heap-based Buffer Overflow Vulnerability KEV Sep 22, 2026
• High CVE-2026-66842 BIG-IP and BIG-IQ Configuration utility vulnerability Sep 2, 2026
• Low CVE-2026-63020 BIG-IP Configuration utility vulnerability Sep 2, 2026
• High CVE-2026-59762 BIG-IP HTTP/2 vulnerability Jul 15, 2026
• Medium CVE-2026-42937 iControl REST and tmsh vulnerability May 13, 2026
• High CVE-2026-42930 Appliance mode iControl REST vulnerability May 13, 2026

Not in any source we poll

Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.

• No fixed version, patch or mitigation documented.
• No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
• No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
• No exploit packet captures, log samples, or incident case IDs supplied.

Answered from this record

Text assembled only from the fields above — no additional claims.

What should defenders know first?

CVE-2023-22839 is "BIG-IP DNS profile vulnerability", rated High. It affects BIG-IP (F5); versions are in the scope table. It is not in CISA KEV, which does not rule out exploitation. CVSS 7.5 describes technical severity. EPSS 0.63% estimates the probability of exploitation in 30 days; neither replaces your asset context. First verify whether exposed or business-critical assets run the affected versions, apply vendor fixes or mitigations, and preserve logs for review.

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