What’s Vulnerable › Vulnerabilities

CVE-2017-12165

• Severity: high (CVSS 7.5 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.9% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2018-07-27 · updated 2026-06-17
• Weakness: CWE-444

Description

It was discovered that Undertow before 1.4.17, 1.3.31 and 2.0.0 processes http request headers with unusual whitespaces which can cause possible http request smuggling.

Affected products

• Red Hat JBoss EAP: 7.0.0, 7.1.0
• Red Hat undertow: from 1.0.0 before 1.3.31; from 1.4.0 before 1.4.17; 2.0.0-alpha_1 — fixed in 1.3.31, 1.4.17

How to fix

Upgrade to a fixed version: Red Hat undertow 1.3.31, 1.4.17. Check the vendor advisory for mitigations.

References

• https://access.redhat.com/errata/RHSA-2017:3454
• https://access.redhat.com/errata/RHSA-2017:3455
• https://access.redhat.com/errata/RHSA-2017:3456
• https://access.redhat.com/errata/RHSA-2017:3458
• https://access.redhat.com/errata/RHSA-2018:0002
• https://access.redhat.com/errata/RHSA-2018:0003
• https://access.redhat.com/errata/RHSA-2018:0004
• https://access.redhat.com/errata/RHSA-2018:0005
• https://access.redhat.com/errata/RHSA-2018:1322
• https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2017-12165
• https://access.redhat.com/errata/RHSA-2017:3454
• https://access.redhat.com/errata/RHSA-2017:3455

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