Vulnerability in F5 Big-Ip Access Policy Manager
CVE-2021-23000
On BIG-IP versions 13.1.3.4-13.1.3.6 and 12.1.5.2, if the tmm.http.rfc.enforcement BigDB key is enabled in a BIG-IP system, or the Bad host header value is checked in the AFM HTTP security profile associated with a virtual server, in rare instances, a specific sequence of malicious requests may cause TMM to restart. Note: Software versions which have reached End of Software Development (EoSD) are not evaluated.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.009 (59.2th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 59th percentile — 59.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.009 · newest: 0.009 · change: 0.000
Affected products
- F5 Big-Ip Access Policy Manager — versions 12.1.5.2
- F5 Big-Ip Advanced Firewall Manager — versions 12.1.5.2
- F5 Big-Ip Advanced Web Application Firewall — versions 12.1.5.2
- F5 Big-Ip Analytics — versions 12.1.5.2
- F5 Big-Ip Application Acceleration Manager — versions 12.1.5.2
- F5 Big-Ip Application Security Manager — versions 12.1.5.2
- F5 Big-Ip Ddos Hybrid Defender — versions 12.1.5.2
- F5 Big-Ip Domain Name System — versions 12.1.5.2
- F5 Big-Ip Fraud Protection Service — versions 12.1.5.2
- F5 Big-Ip Global Traffic Manager — versions 12.1.5.2
Public proof-of-concept exploits
References
- support.f5.com/csp/article/K34441555 (Vendor Advisory)
Frequently asked questions
- What is CVE-2021-23000?
- CVE-2021-23000 is a high-severity vulnerability in F5 Big-Ip Access Policy Manager. CVSS score: 7.5/10. Published 2021-03-31.
- How severe is CVE-2021-23000?
- High severity. CVSS v3 base score is 7.5 out of 10.
- Is CVE-2021-23000 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.