Security readout for executives and security teams
Plain-English summary
This is a denial-of-service risk in specific F5 BIG-IP configurations. Certain undisclosed HTTP/2 requests can drive up memory use, potentially affecting availability. Exposure depends on both a client-side HTTP/2 profile and HTTP MRF Router being enabled on a virtual server.
Executive priority
Treat this as a high-priority availability issue for exposed F5 edge infrastructure. It does not indicate data theft, but outages on load balancers can disrupt customer-facing services.
Technical view
CVE-2023-22664 is CWE-400 resource consumption affecting BIG-IP 17.0.x before 17.0.0.2, 16.1.x before 16.1.3.3, and BIG-IP SPK starting 1.6.0. CVSS 3.1 is 7.5: network reachable, low complexity, no authentication, availability impact only.
Likely exposure
Most relevant to organizations running affected F5 BIG-IP or BIG-IP SPK versions with HTTP/2-facing virtual servers. Systems without the named HTTP/2 and HTTP MRF Router configuration are less likely exposed based on the provided description.
Exploitation context
The source bundle does not cite active exploitation, public exploit code, or CISA KEV listing. The issue is still operationally important because unauthenticated network traffic can affect availability when the vulnerable configuration is present.
Researcher notes
Evidence supports a resource exhaustion flaw triggered by undisclosed requests under a specific BIG-IP HTTP/2 and MRF Router configuration. The bundle does not provide packet details, proof-of-concept status, SPK fixed versions, or workarounds beyond version boundaries.
Mitigation direction
- Upgrade BIG-IP 17.0.x to 17.0.0.2 or later.
- Upgrade BIG-IP 16.1.x to 16.1.3.3 or later.
- For BIG-IP SPK 1.6.0, check current F5 guidance for fixed versions.
- Review whether HTTP/2 and HTTP MRF Router are both required.
- Prioritize exposed production load balancers and internet-facing virtual servers.
Validation and detection
- Inventory BIG-IP and BIG-IP SPK versions against the affected ranges.
- Identify virtual servers with client-side HTTP/2 profiles enabled.
- Check whether HTTP MRF Router is enabled on those virtual servers.
- Monitor memory utilization for abnormal growth on exposed devices.
- Confirm remediation against F5 advisory K56676554 and change records.
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-400: Exact CWE lookup
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Open ATT&CK lookupCVE-2023-22664 mapping review
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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/K56676554CVE 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.
Uncontrolled Resource Consumption
Uncontrolled Resource Consumption represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.