Security readout for executives and security teams
Plain-English summary
CVE-2023-22839 is an F5 BIG-IP availability flaw. In a specific DNS virtual server configuration, certain undisclosed requests can crash TMM, the component that handles traffic. For exposed DNS services, this can interrupt service without authentication or user interaction.
Executive priority
High priority for organizations using BIG-IP DNS services with the matching configuration, especially internet-facing systems. The risk is service disruption, not data theft, but DNS or application availability impact can be material.
Technical view
Affected BIG-IP 17.0.x, 16.1.x, 15.1.x, 14.1.x, and 13.1.x can terminate TMM when a DNS profile has Rapid Response Mode enabled and hardware SYN cookies are enabled. The CVE maps to CWE-476 and CVSS 7.5 with network, low-complexity, unauthenticated availability impact.
Likely exposure
Exposure is limited to BIG-IP virtual servers using a DNS profile with Rapid Response Mode enabled and hardware SYN cookies enabled. Internet-facing DNS virtual servers on affected versions have the most business urgency.
Exploitation context
The provided bundle does not show CISA KEV listing or active exploitation. The triggering requests are undisclosed, so defenders should treat exposure as denial-of-service risk without assuming public exploit details.
Researcher notes
Not every BIG-IP deployment is exposed; the vulnerable condition requires both DNS Rapid Response Mode and hardware SYN cookies. Sources state EoTS versions were not evaluated. Avoid inferring affected products beyond BIG-IP.
Mitigation direction
- Upgrade to fixed BIG-IP versions listed by F5 where available.
- Move 13.1.x systems to a supported unaffected release path.
- Check F5 advisory K37708118 for current vendor guidance.
- Prioritize exposed DNS virtual servers matching the vulnerable configuration.
- Review whether Rapid Response Mode or hardware SYN cookies are required.
Validation and detection
- Inventory BIG-IP versions across DNS-serving devices.
- Identify virtual servers with DNS profiles enabled.
- Confirm whether Rapid Response Mode is enabled on those DNS profiles.
- Confirm whether hardware SYN cookies are enabled.
- Review TMM restart or termination events around DNS traffic spikes.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-476: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2023-22839 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- High
- CVSS
- 7.5 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H3.93.6Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
7.5HighVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://my.f5.com/manage/s/article/K37708118CVE reference
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
NULL Pointer Dereference
NULL Pointer Dereference represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.