Security readout for executives and security teams
Plain-English summary
Certain F5 BIG-IP configurations can be knocked offline by crafted HTTP requests. The issue affects availability, not data theft, and only when specific non-default HTTP enforcement settings are enabled on affected BIG-IP versions. Internet-facing load balancers or application gateways using this configuration should be prioritized for review and update.
Executive priority
High priority for organizations using F5 BIG-IP in front of critical applications. The likely business impact is service disruption, especially on internet-facing virtual servers. Scope the specific configuration first, then patch affected systems through normal change control as soon as feasible.
Technical view
CVE-2023-22422 affects BIG-IP 17.0.x before 17.0.0.2 and 16.1.x before 16.1.3.3. When a virtual server uses an HTTP profile with Enforce HTTP Compliance and Unknown Methods: Reject enabled, undisclosed requests can terminate TMM. CVSS 3.1 is 7.5, network exploitable, unauthenticated, availability impact only.
Likely exposure
Exposure is limited to F5 BIG-IP virtual servers on affected versions with the specific non-default HTTP profile enforcement settings enabled. Public-facing virtual servers are the main concern. Products or versions outside the cited scope should not be assumed affected from this bundle alone.
Exploitation context
The source bundle does not show CISA KEV listing or confirmed active exploitation. The CVE indicates unauthenticated network reachability and low attack complexity, but request details are undisclosed. Treat this as a denial-of-service risk, not evidence of compromise or data access.
Researcher notes
Evidence supports a configuration-dependent denial-of-service condition in TMM tied to HTTP profile enforcement behavior. The request pattern is undisclosed, so validation should focus on asset state, configuration, version, and crash telemetry rather than reproduction. EoTS versions were not evaluated in the cited description.
Mitigation direction
- Upgrade affected BIG-IP 17.0.x systems to 17.0.0.2 or later.
- Upgrade affected BIG-IP 16.1.x systems to 16.1.3.3 or later.
- Review F5 advisory K43881487 for branch-specific guidance and constraints.
- Identify any EoTS deployments and seek vendor-supported upgrade paths.
- Prioritize public-facing BIG-IP virtual servers using affected HTTP profile settings.
Validation and detection
- Inventory BIG-IP versions across load balancers and application delivery controllers.
- Check virtual servers for HTTP profiles with both named enforcement options enabled.
- Confirm upgraded systems report fixed or later versions.
- Review logs and monitoring for unexpected TMM terminations.
- Document exposed public virtual servers and remediation status.
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
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CWE-120: Exact CWE lookup
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Open ATT&CK lookupCVE-2023-22422 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/K43881487CVE 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.
Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
Buffer Copy without Checking Size of Input ('Classic Buffer Overflow') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.