CVE Intelligence
CISA KEV Critical File handling exploit reference

CVE-2020-5902 — F5 BIG-IP Traffic Management User Interface (TMUI) Remote Code Execution Vulnerability

In BIG-IP versions 15.0.0-15.1.0.3, 14.1.0-14.1.2.5, 13.1.0-13.1.3.3, 12.1.0-12.1.5.1, and 11.6.1-11.6.5.1, the Traffic Management User Interface (TMUI), also referred to as the Configuration utility, has a Remote Code Execution (RCE) vulnerability in undisclosed pages.

Published Jul 1, 2020 · Updated Oct 13, 2026 · Sources: CISA Known Exploited Vulnerabilities, NIST National Vulnerability Database, CVE Program (cve.org) e CISA ADP, GitHub Security Advisories · CNA: f5

Who exploits it and how urgent it is

A 0–100 score combining confirmed exploitation, ransomware and APT use, public exploits, EPSS and severity.

CISA KEV · Nov 3, 2021 R used by ransomware (CISA) ☠ BackdoorDiplomacy Detection templates (Nuclei) · 1Metasploit modules · 1Exploit-DB · 3Proofs of concept on GitHub · 55
How the score was calculated
  • Confirmed exploitation (CISA KEV)+35
  • Used in ransomware campaigns (CISA)+10
  • Exploited by 1 threat actor(s) (MITRE ATT&CK)+10
  • Public exploit/PoC (nuclei, metasploit, exploitdb, github)+20
  • EPSS 100% (30-day exploitation probability)+15
  • Technical severity (critical)+10
  • Automatable exploitation (SSVC)+3

The score orders the patch queue; it does not replace your asset context (internet exposure, criticality, compensating controls).

Triage

Is it exploited, how likely is exploitation, what does it touch, and how severe do the sources call it.

Exploitation
Confirmed
CISA KEV, listed Nov 3, 2021
EPSS FIRST
100%
ahead of 100% of scored CVEs · Oct 14, 2026
Affects
F5
Big-ip Access Policy Manager and 13 more
CVSS base
9.8
Critical · 4 source(s)

CISA SSVC assessment CISA

Three decision points CISA publishes for the CVEs it assesses (SSVC 2.0.3). A stakeholder decision, not a severity score.

Exploitation
Active
none · proof-of-concept · active
Automatable
Yes
can an attacker script the kill-chain steps
Technical impact
Total
partial · total control of the vulnerable component

Remediation

Fixes and mitigations documented by the sources — linked to the original advisory.

No fix documented by the sources we poll. That does not mean none exists: check the vendor advisory.

CISA required action CISA

Apply updates per vendor instructions.

US federal deadline: May 3, 2022 — passed 1626 day(s) ago

First 24 hours

Ordered from the record’s own fields — exposure first, because you cannot patch what you have not found. A rule-generated starting point.

  1. Identify exposed assets running the affected vendor/product/version combinations (F5 Big-ip Access Policy Manager, F5 Big-ip Advanced Firewall Manager, F5 Big-ip Advanced Web Application Firewall…).
  2. Treat as emergency remediation: the CVE is in CISA KEV (confirmed exploitation).
  3. The attack is network-based and needs no privileges: restrict exposure (ACLs, VPN, WAF) until patched.
  4. No fix documented in the sources: reduce exposure and monitor the vendor advisory.
  5. EPSS ahead of 100% of scored CVEs: prioritize it in the patch queue.
  6. Search available logs for exploit probes matching the vulnerability class (file handling), errors and authentication anomalies.

Affected scope

Vendor, product and versions as the sources word them.

VendorProductVersionsStatusSource
F5 Big-ip Access Policy Manager ≥ 12.1.0 and < 12.1.5.2≥ 11.6.1 and < 11.6.5.2≥ 15.1.0 and < 15.1.0.4≥ 15.0.0 and ≤ 15.0.1.4≥ 14.1.0 and < 14.1.2.6≥ 13.1.0 and < 13.1.3.4 Vulnerable NIST National Vulnerability Database
F5 Big-ip Advanced Firewall Manager ≥ 11.6.1 and < 11.6.5.2≥ 12.1.0 and < 12.1.5.2≥ 13.1.0 and < 13.1.3.4≥ 14.1.0 and < 14.1.2.6≥ 15.0.0 and < 15.0.1.4≥ 15.1.0 and < 15.1.0.4 Vulnerable NIST National Vulnerability Database
F5 Big-ip Advanced Web Application Firewall ≥ 15.0.0 and < 15.0.1.4≥ 14.1.0 and < 14.1.2.6≥ 13.1.0 and < 13.1.3.4≥ 12.1.0 and < 12.1.5.2≥ 11.6.1 and < 11.6.5.2≥ 15.1.0 and < 15.1.0.4 Vulnerable NIST National Vulnerability Database
F5 Big-ip Analytics ≥ 15.0.0 and < 15.0.1.4≥ 14.1.0 and < 14.1.2.6≥ 13.1.0 and < 13.1.3.4≥ 12.1.0 and < 12.1.5.2≥ 11.6.1 and < 11.6.5.2≥ 15.1.0 and < 15.1.0.4 Vulnerable NIST National Vulnerability Database
F5 Big-ip Application Acceleration Manager ≥ 15.1.0 and < 15.1.0.4≥ 15.0.0 and < 15.0.1.4≥ 14.1.0 and < 14.1.2.6≥ 13.1.0 and < 13.1.3.4≥ 11.6.1 and < 11.6.5.2≥ 12.1.0 and < 12.1.5.2 Vulnerable NIST National Vulnerability Database
F5 Big-ip Application Security Manager ≥ 11.6.1 and < 11.6.5.2≥ 12.1.0 and < 12.1.5.2≥ 13.1.0 and < 13.1.3.4≥ 14.1.0 and < 14.1.2.6≥ 15.0.0 and < 15.0.1.4≥ 15.1.0 and < 15.1.0.4 Vulnerable NIST National Vulnerability Database
F5 Big-ip Ddos Hybrid Defender ≥ 11.6.1 and < 11.6.5.2≥ 12.1.0 and < 12.1.5.2≥ 13.1.0 and < 13.1.3.4≥ 14.1.0 and < 14.1.2.6≥ 15.0.0 and < 15.0.1.4≥ 15.1.0 and < 15.1.0.4 Vulnerable NIST National Vulnerability Database
F5 Big-ip Domain Name System ≥ 12.1.0 and < 12.1.5.2≥ 11.6.1 and < 11.6.5.2≥ 15.1.0 and < 15.1.0.4≥ 15.0.0 and < 15.0.1.4≥ 14.1.0 and < 14.1.2.6≥ 13.1.0 and < 13.1.3.4 Vulnerable NIST National Vulnerability Database
F5 Big-ip Fraud Protection Service ≥ 14.1.0 and < 14.1.2.6≥ 13.1.0 and < 13.1.3.4≥ 12.1.0 and < 12.1.5.2≥ 11.6.1 and < 11.6.5.2≥ 15.0.0 and < 15.0.1.4≥ 15.1.0 and < 15.1.0.4 Vulnerable NIST National Vulnerability Database
F5 Big-ip Global Traffic Manager ≥ 15.1.0 and < 15.1.0.4≥ 15.0.0 and < 15.0.1.4≥ 14.1.0 and < 14.1.2.6≥ 13.1.0 and < 13.1.3.4≥ 12.1.0 and < 12.1.5.2≥ 11.6.1 and < 11.6.5.2 Vulnerable NIST National Vulnerability Database
F5 Big-ip Link Controller ≥ 11.6.1 and < 11.6.5.2≥ 12.1.0 and < 12.1.5.2≥ 13.1.0 and < 13.1.3.4≥ 14.1.0 and < 14.1.2.6≥ 15.0.0 and < 15.0.1.4≥ 15.1.0 and < 15.1.0.4 Vulnerable NIST National Vulnerability Database
F5 Big-ip Local Traffic Manager ≥ 12.1.0 and < 12.1.5.2≥ 13.1.0 and < 13.1.3.4≥ 14.1.0 and < 14.1.2.6≥ 15.0.0 and < 15.0.1.4≥ 15.1.0 and < 15.1.0.4≥ 11.6.1 and < 11.6.5.2 Vulnerable NIST National Vulnerability Database
F5 Big-ip Policy Enforcement Manager ≥ 11.6.1 and < 11.6.5.2≥ 15.1.0 and < 15.1.0.4≥ 15.0.0 and < 15.0.1.4≥ 14.1.0 and < 14.1.2.6≥ 13.1.0 and < 13.1.3.4≥ 12.1.0 and < 12.1.5.2 Vulnerable NIST National Vulnerability Database
F5 Ssl Orchestrator ≥ 11.6.1 and < 11.6.5.2≥ 12.1.0 and < 12.1.5.2≥ 13.1.0 and < 13.1.3.4≥ 14.1.0 and < 14.1.2.6≥ 15.0.0 and < 15.0.1.4≥ 15.1.0 and < 15.1.0.4 Vulnerable NIST National Vulnerability Database

Attack characteristics

The CVSS vector, decoded. It describes the attack, not your exposure to it.

Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Every base score collected

Sources score independently and may disagree; each row says who scored it and under which version.

ScoreVersionSeverityExpl.ImpactScored by
9.8 CVSS 3.1 Critical 3.9 5.9 nvd@nist.gov via NIST National Vulnerability Database
9.8 CVSS 3.1 Critical 3.9 5.9 134c704f-9b21-4f2e-91b3-4a467353bcc0 via NIST National Vulnerability Database
9.8 CVSS 3.1 Critical — — GitHub, Inc. via GitHub Security Advisories
9.8 CVSS 3.1 Critical — — CISA-ADP via CVE Program (cve.org) e CISA ADP
10.0 CVSS 2.0 High 10.0 10.0 nvd@nist.gov via NIST National Vulnerability Database
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H (score shown at the top: nvd@nist.gov)

Weakness MITRE

Weakness class according to MITRE’s CWE catalog.

CWE-22 · Path Traversal

Other CVEs with this weakness →

CISA KEV details CISA

CISA lists a CVE once it has evidence of exploitation against real targets.

Listed
Nov 3, 2021
Federal deadline
May 3, 2022
passed 1626 day(s) ago
Ransomware use
Known

CISA records ransomware use only for campaigns it has confirmed, so “Unknown” means unrecorded, not ruled out. The deadline binds US federal agencies; for everyone else it is a reference date.

Public exploits, PoCs and detection templates

Public code that demonstrates or tests the flaw raises the odds of mass exploitation — and Nuclei templates help find vulnerable assets in your environment.

Detection templates (Nuclei)
Metasploit modules
Exploit-DB
Proofs of concept on GitHub — 55 repositories; showing the 10 most starred

Warning: public PoCs are sometimes disguised malware. Use them only for authorized testing in an isolated environment. This portal does not host exploit code — it only points to the sources.

Threat actors exploiting this CVE MITRE ATT&CK

According to MITRE ATT&CK.

BackdoorDiplomacy G0135

EPSS over time FIRST

Oct 13, 2026 → Oct 14, 2026 · 2 reading(s) · max 100.00%

Detection

Read off the CVSS vector and the weakness class. Starting points, not tested rules.

  • Prioritize edge telemetry for the network-reachable component (proxy, WAF, IDS/IPS).
  • Monitor file creation in web directories and paths with traversal sequences (../).
  • Hunt retroactively in logs from before Nov 3, 2021 (KEV listing): exploitation may have started earlier.
web/proxy/WAF logsnetwork IDS/IPSfile integrity (FIM)endpoint telemetry (EDR)

Timeline

What happened to this CVE, newest first.

  • 2026
  • SSVC assessment updated
    Oct 13, 2026 · CVE Program (cve.org) e CISA ADP
  • Record published
    Oct 13, 2026
  • Affected products added · f5/big-ip access policy manager, f5/big-ip advanced firewall manager, f5/big-ip advanced web application firewall, f5/bi
    Oct 13, 2026 · NIST National Vulnerability Database
  • CVSS changed · 9.8
    Oct 13, 2026 · NIST National Vulnerability Database
  • Source status changed · → Analyzed
    Oct 13, 2026 · NIST National Vulnerability Database
  • Added to CISA KEV (detected)
    Oct 13, 2026 · CISA Known Exploited Vulnerabilities
  • Record created in this database
    Oct 13, 2026 · CISA Known Exploited Vulnerabilities
  • 2021
  • Added to CISA KEV catalog
    Nov 2, 2021 · CISA
  • 2020
  • CVE published
    Jul 1, 2020 · f5

Source activity

Repeated readings are counted rather than listed.

  • 2× References added · Oct 13, 2026 – Oct 13, 2026
  • 1× Official description updated · Oct 13, 2026 – Oct 13, 2026

References

18 on the record

Elsewhere on this site

F5
every CVE for this vendor
2021-11
what else CISA listed that month
File handling
same class
CWE-22
other pages naming this weakness

Related CVEs (same products)

  • CVE-2026-94127 F5 BIG-IP APM Heap-based Buffer Overflow Vulnerability KEV 23d
  • CVE-2026-63020 BIG-IP Configuration utility vulnerability Sep 2, 2026
  • CVE-2026-42937 iControl REST and tmsh vulnerability May 13, 2026
  • CVE-2026-42930 Appliance mode iControl REST vulnerability May 13, 2026
  • CVE-2026-42919 F5 BIG-IP Appliance Mode Vulnerability May 13, 2026
  • CVE-2026-42920 BIG-IP DTLS Vulnerability May 13, 2026

Not in any source we poll

Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.

  • No fixed version, patch or mitigation documented.
  • No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
  • No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
  • No exploit packet captures, log samples, or incident case IDs supplied.

Answered from this record

Text assembled only from the fields above — no additional claims.

What should defenders know first?

CVE-2020-5902 is "F5 BIG-IP Traffic Management User Interface (TMUI) Remote Code Execution Vulnerability", rated Critical. It affects Big-ip Access Policy Manager (F5); versions are in the scope table. It is in CISA KEV: there is evidence of real-world exploitation. CVSS 9.8 describes technical severity. EPSS 100.00% estimates the probability of exploitation in 30 days; neither replaces your asset context. First verify whether exposed or business-critical assets run the affected versions, apply vendor fixes or mitigations, and preserve logs for review.

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