← Vulnerability feed

Vulnerability record · CVE-2020-5947 · published 19 November 2020

CVE-2020-5947: F5 big-ip access policy manager vulnerability

F5 · Big Ip Access Policy Manager

In versions 16.0.0-16.0.0.1 and 15.1.0-15.1.1, on specific BIG-IP platforms, attackers may be able to obtain TCP sequence numbers from the BIG-IP system that can be reused in future connections with the same source and destination port and IP numbers. Only these platforms are affected: BIG-IP 2000 series (C112), BIG-IP 4000 series (C113), BIG-IP i2000 series (C117), BIG-IP i4000 series (C115), BIG-IP Virtual Edition (VE).

4.3 CVSS 3.1 Medium EPSS 0.70% · top 48.6%
4.3CVSS 3.1 base score, v2 4.0
0.70%EPSS exploitation probability, 30 days
NoNot in CISA KEV
14Affected product versions listed by NVD
2References
17 Jun 2026Last modified by NVD

Description

In versions 16.0.0-16.0.0.1 and 15.1.0-15.1.1, on specific BIG-IP platforms, attackers may be able to obtain TCP sequence numbers from the BIG-IP system that can be reused in future connections with the same source and destination port and IP numbers. Only these platforms are affected: BIG-IP 2000 series (C112), BIG-IP 4000 series (C113), BIG-IP i2000 series (C117), BIG-IP i4000 series (C115), BIG-IP Virtual Edition (VE).

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

Affected products

14 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://support.f5.com/csp/article/K64571774 Vendor Advisory
https://support.f5.com/csp/article/K64571774 Vendor Advisory

Track CVE-2020-5947 inside VULONE

Watch it alongside the ransomware crews, C2 infrastructure and forum chatter that reference it, query it through the API and pull it into your SIEM over TAXII.

Start free Open in platform

Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2023-46747F5 BIG-IP configuration utility authentication bypass allows command executionUndisclosed requests can bypass authentication in the BIG-IP configuration utility, letting a network-positioned attacker execute arbitrary system co…KEVEPSS 97%analysed9.8CVE-2022-1388F5 BIG-IP iControl REST authentication bypassUndisclosed requests to the iControl REST interface on multiple F5 BIG-IP modules can bypass authentication, allowing an unauthenticated remote attac…KEVEPSS 100%analysed9.8CVE-2021-22991F5 BIG-IP TMM URI normalization buffer overflowF5 BIG-IP's Traffic Management Microkernel (TMM) mishandles URI normalization for undisclosed requests to a virtual server, triggering a buffer overf…KEVEPSS 61%analysed9.8CVE-2021-22986F5 BIG-IP iControl REST unauthenticated remote command executionThe iControl REST interface on multiple F5 BIG-IP and BIG-IQ versions exposes an unauthenticated remote command execution flaw, tracked as CWE-918 se…KEVEPSS 100%analysed9.8CVE-2020-5902F5 BIG-IP TMUI path traversal leading to remote code executionThe F5 BIG-IP Traffic Management User Interface (TMUI, also called the Configuration utility) contains a path traversal flaw (CWE-22) in undisclosed …KEVEPSS 100%analysed9.8CVE-2014-7169GNU Bash environment variable function parsing command injection (Shellshock variant)GNU Bash through 4.3 bash43-025 processes trailing strings after malformed function definitions in environment variable values, allowing command inje…KEVEPSS 100%analysed9.8CVE-2014-6271GNU Bash environment variable command injection (ShellShock)GNU Bash through 4.3 processes trailing strings after function definitions in environment variable values, allowing injected commands to run when Bas…KEVEPSS 100%analysed9.3CVE-2026-94127F5 big-ip access policy manager heap-based buffer overflow vulnerabilityWhen a BIG-IP APM access policy and an OAuth profile are configured on a virtual server, specific malicious traffic can lead to remote code execution…KEVEPSS 2.2%

Source: NIST National Vulnerability Database (record CVE-2020-5947), CISA KEV, FIRST EPSS (scores of 2026-10-03). This page is refreshed as NVD updates the record.