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Vulnerability record · CVE-2011-1498 · published 7 July 2011

CVE-2011-1498: Apache httpclient information exposure vulnerability

Apache · Httpclient

Apache HttpClient 4.x before 4.1.1 in Apache HttpComponents, when used with an authenticating proxy server, sends the Proxy-Authorization header to the origin server, which allows remote web servers to obtain sensitive information by logging this header.

4.3 CVSS 2.0 Medium EPSS 6.7% · top 6.3% CWE-200 · Information exposure
4.3CVSS 2.0 base score
6.7%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
28References
16 Jun 2026Last modified by NVD

Description

Apache HttpClient 4.x before 4.1.1 in Apache HttpComponents, when used with an authenticating proxy server, sends the Proxy-Authorization header to the origin server, which allows remote web servers to obtain sensitive information by logging this header.

AV:N/AC:M/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://lists.fedoraproject.org/pipermail/package-announce/2011-June/061440.html
http://marc.info/?l=httpclient-users&m=129853896315461&w=2
http://marc.info/?l=httpclient-users&m=129856318011586&w=2
http://marc.info/?l=httpclient-users&m=129857589129183&w=2
http://marc.info/?l=httpclient-users&m=129858274406594&w=2
http://marc.info/?l=httpclient-users&m=129858299106950&w=2
http://openwall.com/lists/oss-security/2011/04/07/7
http://openwall.com/lists/oss-security/2011/04/08/1
http://securityreason.com/securityalert/8298
http://www.apache.org/dist/httpcomponents/httpclient/RELEASE_NOTES-4.1.x.txt
http://www.kb.cert.org/vuls/id/153049 US Government Resource
http://www.securityfocus.com/bid/46974
https://bugzilla.redhat.com/show_bug.cgi?id=709531
https://issues.apache.org/jira/browse/HTTPCLIENT-1061
http://lists.fedoraproject.org/pipermail/package-announce/2011-June/061440.html
http://marc.info/?l=httpclient-users&m=129853896315461&w=2
http://marc.info/?l=httpclient-users&m=129856318011586&w=2
http://marc.info/?l=httpclient-users&m=129857589129183&w=2
http://marc.info/?l=httpclient-users&m=129858274406594&w=2
http://marc.info/?l=httpclient-users&m=129858299106950&w=2
http://openwall.com/lists/oss-security/2011/04/07/7
http://openwall.com/lists/oss-security/2011/04/08/1
http://securityreason.com/securityalert/8298
http://www.apache.org/dist/httpcomponents/httpclient/RELEASE_NOTES-4.1.x.txt
http://www.kb.cert.org/vuls/id/153049 US Government Resource
http://www.securityfocus.com/bid/46974
https://bugzilla.redhat.com/show_bug.cgi?id=709531
https://issues.apache.org/jira/browse/HTTPCLIENT-1061

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Source: NIST National Vulnerability Database (record CVE-2011-1498), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.