BIG-IP Advanced WAF, ASM, and APM: Always-Incorrect Control Flow Implementation
CVE-2022-26890 is a high-severity always-incorrect control flow implementation vulnerability in BIG-IP Advanced WAF, ASM, and APM from F5, with a CVSS 3.1 base score of 7.5 out of 10. It can be exploited remotely over the network by an unauthenticated attacker, without any action from a user. The record lists versions 16.1.2.1, 15.1.5, 14.1.4.6 as the first without the flaw, so updating BIG-IP Advanced WAF, ASM, and APM to one of those releases or later removes the exposure. There is no confirmed exploitation so far. EPSS estimates a 0.96% chance of exploitation within 30 days, higher than 62% of scored CVEs.
High severity with no evidence of exploitation so far.
What to do
- Update BIG-IP Advanced WAF, ASM, and APM to 16.1.2.1 or 15.1.5 or 14.1.4.6 or 13.1.5, whichever matches your release line, or a later version.
- Read the advisory on support.f5.com for workarounds and exact fixed builds.
- Until you can update, restrict network access to the affected service so it is not reachable from untrusted networks.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| F5 | BIG-IP Advanced WAF, ASM, and APM | 16.1.x up to, but not including, 16.1.2.1; 15.1.x up to, but not including, 15.1.5; 14.1.x up to, but not including, 14.1.4.6; 13.1.x up to, but not including, 13.1.5 | 16.1.2.1, 15.1.5, 14.1.4.6, 13.1.5 |
| F5 | Big-ip Access Policy Manager | 13.1.0; 13.1.1; 13.1.3; 13.1.4; 13.1.5; 14.1.0; 14.1.2; 14.1.3; and 10 more ranges | Not stated |
| F5 | Big-ip Advanced Web Application Firewall | 13.1.0; 13.1.1; 13.1.3; 13.1.4; 13.1.5; 14.1.0; 14.1.2; 14.1.3; and 10 more ranges | Not stated |
| F5 | Big-ip Application Security Manager | 13.1.0; 13.1.1; 13.1.3; 13.1.4; 13.1.5; 14.1.0; 14.1.2; 14.1.3; and 10 more ranges | Not stated |
Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.
How the severity score breaks down
- Attack vector
- NetworkCan be exploited remotely over a network, including the internet.
- Attack complexity
- LowNo special conditions are needed; the attack works reliably.
- Privileges required
- NoneNo account or login is needed.
- User interaction
- NoneNo action by a victim is required.
- Scope
- UnchangedImpact stays within the vulnerable component.
- Confidentiality
- NoneNo data is disclosed.
- Integrity
- NoneNothing can be modified.
- Availability
- HighThe component can be taken down completely.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H. Scored by NVD.
| Scoring system | Score | Severity | Scored by |
|---|---|---|---|
| CVSS 3.1 | 7.5 | High | CNA (f5.com) |
| CVSS 3.1 | 7.5 | High | NVD |
| CVSS 2.0 | 5.0 | Medium | NVD |
Official description
On F5 BIG-IP Advanced WAF, ASM, and APM 16.1.x versions prior to 16.1.2.1, 15.1.x versions prior to 15.1.5, 14.1.x versions prior to 14.1.4.6, and 13.1.x versions prior to 13.1.5, when ASM or Advanced WAF, as well as APM, are configured on a virtual server, the ASM policy is configured with Session Awareness, and the "Use APM Username and Session ID" option is enabled, undisclosed requests can cause the bd process to terminate. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Always-Incorrect Control Flow Implementation
The code contains a control flow path that does not reflect the algorithm that the path is intended to implement, leading to incorrect behavior any time this path is navigated.
More Always-Incorrect Control Flow Implementation vulnerabilities (CWE-670)
Timeline
- CVE record published.
- Record last changed materially (score, affected products, status or references).
References
Advisories
Recent Always-Incorrect Control Flow Implementation vulnerabilities
- 7.5 High severity
- 9.8 Critical severity
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