CVE-2017-2666
This could be exploited, in conjunction with a proxy that also permitted the invalid characters but with a different interpretation, to inject data into the HTTP response.
Does this matter?
Lower severity and a low EPSS score (3.09%). Track it; it rarely justifies an emergency change on its own.
Description
It was discovered in Undertow that the code that parsed the HTTP request line permitted invalid characters. This could be exploited, in conjunction with a proxy that also permitted the invalid characters but with a different interpretation, to inject data into the HTTP response. By manipulating the HTTP response the attacker could poison a web-cache, perform an XSS attack, or obtain sensitive information from requests other than their own.
- CVSS 3.0
- 6.5 MEDIUMCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
- EPSS
- 3.09% probability · 88th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-444
- Affected
- redhat/undertow · redhat/jboss enterprise application platform · debian/debian linux
- Source
- secalert@redhat.com
EPSS 3.1% since 27 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- http://rhn.redhat.com/errata/RHSA-2017-1409.htmlVendor Advisory
- http://www.securityfocus.com/bid/98966Third Party Advisory, VDB Entry
- https://access.redhat.com/errata/RHSA-2017:1410Vendor Advisory
- https://access.redhat.com/errata/RHSA-2017:1411Vendor Advisory
- https://access.redhat.com/errata/RHSA-2017:1412Vendor Advisory
- https://access.redhat.com/errata/RHSA-2017:3454Vendor Advisory
- https://access.redhat.com/errata/RHSA-2017:3455Vendor Advisory
- https://access.redhat.com/errata/RHSA-2017:3456Vendor Advisory
- https://access.redhat.com/errata/RHSA-2017:3458Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2017-2666Issue Tracking, Vendor Advisory
- https://www.debian.org/security/2017/dsa-3906Third Party Advisory
- http://rhn.redhat.com/errata/RHSA-2017-1409.htmlVendor Advisory
- http://www.securityfocus.com/bid/98966Third Party Advisory, VDB Entry
- https://access.redhat.com/errata/RHSA-2017:1410Vendor Advisory
- https://access.redhat.com/errata/RHSA-2017:1411Vendor Advisory
- https://access.redhat.com/errata/RHSA-2017:1412Vendor Advisory
- https://access.redhat.com/errata/RHSA-2017:3454Vendor Advisory
- https://access.redhat.com/errata/RHSA-2017:3455Vendor Advisory
- https://access.redhat.com/errata/RHSA-2017:3456Vendor Advisory
- https://access.redhat.com/errata/RHSA-2017:3458Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2017-2666Issue Tracking, Vendor Advisory
- https://www.debian.org/security/2017/dsa-3906Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.