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Vulnerability record · CVE-2011-1475 · published 8 April 2011

CVE-2011-1475: Apache tomcat improper input validation vulnerability

Apache · Tomcat

The HTTP BIO connector in Apache Tomcat 7.0.x before 7.0.12 does not properly handle HTTP pipelining, which allows remote attackers to read responses intended for other clients in opportunistic circumstances by examining the application data in HTTP packets, related to "a mix-up of responses for requests from different users."

5.0 CVSS 2.0 Medium EPSS 8.7% · top 5.0% CWE-20 · Improper input validation
5.0CVSS 2.0 base score
8.7%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
24References
16 Jun 2026Last modified by NVD

Description

The HTTP BIO connector in Apache Tomcat 7.0.x before 7.0.12 does not properly handle HTTP pipelining, which allows remote attackers to read responses intended for other clients in opportunistic circumstances by examining the application data in HTTP packets, related to "a mix-up of responses for requests from different users."

AV:N/AC:L/Au:N/C:P/I:N/A:N

Affected products

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

References

LinkTags
http://seclists.org/fulldisclosure/2011/Apr/97
http://securityreason.com/securityalert/8188
http://svn.apache.org/viewvc?view=revision&revision=1086349 Patch
http://svn.apache.org/viewvc?view=revision&revision=1086352 Patch
http://tomcat.apache.org/security-7.html Vendor Advisory
http://www.securityfocus.com/archive/1/517363
http://www.securityfocus.com/bid/47199
http://www.securitytracker.com/id?1025303
http://www.vupen.com/english/advisories/2011/0894
https://exchange.xforce.ibmcloud.com/vulnerabilities/66676
https://issues.apache.org/bugzilla/show_bug.cgi?id=50957
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A12374
http://seclists.org/fulldisclosure/2011/Apr/97
http://securityreason.com/securityalert/8188
http://svn.apache.org/viewvc?view=revision&revision=1086349 Patch
http://svn.apache.org/viewvc?view=revision&revision=1086352 Patch
http://tomcat.apache.org/security-7.html Vendor Advisory
http://www.securityfocus.com/archive/1/517363
http://www.securityfocus.com/bid/47199
http://www.securitytracker.com/id?1025303
http://www.vupen.com/english/advisories/2011/0894
https://exchange.xforce.ibmcloud.com/vulnerabilities/66676
https://issues.apache.org/bugzilla/show_bug.cgi?id=50957
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A12374

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

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Source: NIST National Vulnerability Database (record CVE-2011-1475), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.