CVE-2019-6631

Name: CVE-2019-6631
Creator: NVD / NIST
Published: 2019-07-03T18:15:10.977+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 2.53%

Last modified Jun 17, 2026

CVE-2019-6631 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. On BIG-IP 11.5.1-11.6.4, iRules performing HTTP header manipulation may cause an interruption to service when processing traffic handled by a Virtual Server with an associated HTTP profile, in specific circumstances, when the requests do not strictly conform to RFCs.. EPSS estimates a 2.53% chance of exploitation in the next 30 days.

Description

On BIG-IP 11.5.1-11.6.4, iRules performing HTTP header manipulation may cause an interruption to service when processing traffic handled by a Virtual Server with an associated HTTP profile, in specific circumstances, when the requests do not strictly conform to RFCs.

Metrics

CVSS 3.1

7.5/10

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

EPSS Probability

2.53%

82.9th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Vendor	Product	Versions
F5	Big-Ip Local Traffic Manager	>= 11.5.2, <= 11.6.4
F5	Big-Ip Application Acceleration Manager	>= 11.5.2, <= 11.6.4
F5	Big-Ip Advanced Firewall Manager	>= 11.5.2, <= 11.6.4
F5	Big-Ip Analytics	>= 11.5.2, <= 11.6.4
F5	Big-Ip Access Policy Manager	>= 11.5.2, <= 11.6.4
F5	Big-Ip Application Security Manager	>= 11.5.2, <= 11.6.4
F5	Big-Ip Domain Name System	>= 11.5.2, <= 11.6.4
F5	Big-Ip Edge Gateway	>= 11.5.2, <= 11.6.4
F5	Big-Ip Global Traffic Manager	>= 11.5.2, <= 11.6.4
F5	Big-Ip Link Controller	>= 11.5.2, <= 11.6.4
F5	Big-Ip Policy Enforcement Manager	>= 11.5.2, <= 11.6.4
F5	Big-Ip Webaccelerator	>= 11.5.2, <= 11.6.4
F5	Big-Ip Websafe	>= 11.5.2, <= 11.6.4

References

http://www.securityfocus.com/bid/109119Broken Link, Third Party Advisory, VDB Entry
https://support.f5.com/csp/article/K19501795Vendor Advisory
https://support.f5.com/csp/article/K19501795?utm_source=f5support&amp%3Butm_medium=RSS
http://www.securityfocus.com/bid/109119Broken Link, Third Party Advisory, VDB Entry
https://support.f5.com/csp/article/K19501795Vendor Advisory
https://support.f5.com/csp/article/K19501795?utm_source=f5support&amp%3Butm_medium=RSS

Timeline

Published: Jul 3, 2019
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2019-6631?

How severe is CVE-2019-6631?

CVE-2019-6631 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 2.53% probability of exploitation in the next 30 days.

How do I fix CVE-2019-6631?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2019-6631?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST