PT-2020-18772 · F5 · Big-Ip

Published 2020-04-30 · Updated 2020-05-05 · CVE-2020-5871

Positive Technologies (AI Summary)

CVSS v3.1

7.5

High

Base vector

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

Name of the Vulnerable Software and Affected Versions F5 BIG-IP versions 14.1.0 through 14.1.2.3

Description The issue allows undisclosed requests to cause a denial of service (DoS) when sent to BIG-IP HTTP/2 virtual servers. This problem occurs when ciphers, which have been blacklisted by the HTTP/2 RFC, are used on backend servers. It is a data-plane issue with no control-plane exposure.

Recommendations For versions 14.1.0 through 14.1.2.3, consider restricting the use of blacklisted ciphers on backend servers to minimize the risk of exploitation. As a temporary workaround, restrict access to BIG-IP HTTP/2 virtual servers until a patch is available.

Fix

Related Identifiers

CVE-2020-5871

Affected Products

Big-Ip

References · 4

• https://support.f5.com/csp/article/K43450419 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2020-5871 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2020-5871 · Security Note
• https://t.me/cvenotify/3457 · Telegram Post