BIG-IP PEM iRules vulnerability
Published May 13, 2026
8.7
HIGHCVSS 4.0
EPSS 0.46%
Description
When BIG-IP PEM iRules are configured on a virtual server (iRules using commands starting with CLASSIFICATION::, CLASSIFY::, PEM::, PSC::, and the urlcatquery command), undisclosed traffic can cause the Traffic Management Microkernel (TMM) to terminate. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.
Affected products
-
- Version 16.1.0StatusaffectedConstraints<*
- Version 17.1.0StatusaffectedConstraints<17.1.3.1
- Version 17.5.0StatusaffectedConstraints<17.5.1.4
- Version 21.0.0StatusaffectedConstraints<21.0.0.1
- Version 21.1.0StatusunaffectedConstraints<*
- Version
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
Configuration 1
- ≥ 17.1.0 · ≤ 17.1.3
- ≥ 17.5.0 · ≤ 17.5.1
- ≥ 17.1.0 · ≤ 17.1.3
- ≥ 17.5.0 · ≤ 17.5.1
- ≥ 17.1.0 · ≤ 17.1.3
- ≥ 17.5.0 · ≤ 17.5.1
- ≥ 17.1.0 · ≤ 17.1.3
- ≥ 17.5.0 · ≤ 17.5.1
- ≥ 17.1.0 · ≤ 17.1.3
- ≥ 17.5.0 · ≤ 17.5.1
- ≥ 17.1.0 · ≤ 17.1.3
- ≥ 17.5.0 · ≤ 17.5.1
- ≥ 17.1.0 · ≤ 17.1.3
- ≥ 17.5.0 · ≤ 17.5.1
- ≥ 17.1.0 · ≤ 17.1.3
- ≥ 17.5.0 · ≤ 17.5.1
- ≥ 17.1.0 · ≤ 17.1.3
- ≥ 17.5.0 · ≤ 17.5.1
- ≥ 17.1.0 · ≤ 17.1.3
- ≥ 17.5.0 · ≤ 17.5.1
- ≥ 17.1.0 · ≤ 17.1.3
- ≥ 17.5.0 · ≤ 17.5.1
- ≥ 17.1.0 · ≤ 17.1.3
- ≥ 17.5.0 · ≤ 17.5.1
- ≥ 17.1.0 · ≤ 17.1.3
- ≥ 17.5.0 · ≤ 17.5.1
- ≥ 17.1.0 · ≤ 17.1.3
- ≥ 17.5.0 · ≤ 17.5.1
- ≥ 17.1.0 · ≤ 17.1.3
- ≥ 17.5.0 · ≤ 17.5.1
- ≥ 17.1.0 · ≤ 17.1.3
- ≥ 17.5.0 · ≤ 17.5.1
- ≥ 17.1.0 · ≤ 17.1.3
- ≥ 17.5.0 · ≤ 17.5.1
- ≥ 17.1.0 · ≤ 17.1.3
- ≥ 17.5.0 · ≤ 17.5.1
- ≥ 17.1.0 · ≤ 17.1.3
- ≥ 17.5.0 · ≤ 17.5.1
- ≥ 17.1.0 · ≤ 17.1.3
- ≥ 17.5.0 · ≤ 17.5.1
- ≥ 17.1.0 · ≤ 17.1.3
- ≥ 17.5.0 · ≤ 17.5.1
Configuration 2
- ≥ 16.1.0 · ≤ 16.1.6
- ≥ 16.1.0 · ≤ 16.1.6
- ≥ 16.1.0 · ≤ 16.1.6
- ≥ 16.1.0 · ≤ 16.1.6
- ≥ 16.1.0 · ≤ 16.1.6
- ≥ 16.1.0 · ≤ 16.1.6
- ≥ 16.1.0 · ≤ 16.1.6
- ≥ 16.1.0 · ≤ 16.1.6
- ≥ 16.1.0 · ≤ 16.1.6
- ≥ 16.1.0 · ≤ 16.1.6
- ≥ 16.1.0 · ≤ 16.1.6
- ≥ 16.1.0 · ≤ 16.1.6
- ≥ 16.1.0 · ≤ 16.1.6
- ≥ 16.1.0 · ≤ 16.1.6
- ≥ 16.1.0 · ≤ 16.1.6
- ≥ 16.1.0 · ≤ 16.1.6
- ≥ 16.1.0 · ≤ 16.1.6
- ≥ 16.1.0 · ≤ 16.1.6
- ≥ 16.1.0 · ≤ 16.1.6
- ≥ 16.1.0 · ≤ 16.1.6
- ≥ 16.1.0 · ≤ 16.1.6
Configuration 3
- 21.0.0
- 21.0.0
- 21.0.0
- 21.0.0
- 21.0.0
- 21.0.0
- 21.0.0
- 21.0.0
- 21.0.0
- 21.0.0
- 21.0.0
- 21.0.0
- 21.0.0
- 21.0.0
- 21.0.0
- 21.0.0
- 21.0.0
- 21.0.0
- 21.0.0
- 21.0.0
- 21.0.0
No data.
No Red Hat product state for this CVE.
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
1 other source (NVD) ▾
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
No CVSS v3.0 score for this CVE.
No CVSS v2.0 score for this CVE.
This CVE is not in the KEV list.
CISA SSVC (Vulnrichment)
Stakeholder-Specific Vulnerability Categorization from CISA ADP.
Exploitation
NoneAutomatable
YesTechnical Impact
PartialDecision
n/aAssessed May 13, 2026 · SSVC 2.0.3
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
Score over time
May–Oct 2026- EPSS v4
- EPSS v5
Percentile over time
- EPSS v4
- EPSS v5
Table of values (3 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 0.46% (0.00460) | 37.56th | v5 (v2026.06.15) |
| Jun 15, 2026 | 0.26% (0.00263) | 17.42th | v5 (v2026.06.15) |
| May 14, 2026 | 0.07% (0.00072) | 21.79th | v4 (v2025.03.14) |
References (1)
- https://my.f5.com/manage/s/article/K000160875 vendor-advisorypatchMitigationVendor Advisory
| Link | Providers | Tags |
|---|---|---|
| https://my.f5.com/manage/s/article/K000160875 | vendor-advisorypatchMitigationVendor Advisory |
Change history (0)
No recorded changes yet.