CVE-2011-5279

Name: CVE-2011-5279
Creator: NVD / NIST
Published: 2014-04-23T20:55:06.623+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

UnknownEPSS 19.09%

Last modified Jun 16, 2026

CVE-2011-5279 is a vulnerability of currently unknown severity. CRLF injection vulnerability in the CGI implementation in Microsoft Internet Information Services (IIS) 4.x and 5.x on Windows NT and Windows 2000 allows remote attackers to modify arbitrary uppercase environment variables via a \n (newline) character in an HTTP header.. EPSS estimates a 19.09% chance of exploitation in the next 30 days.

Description

CRLF injection vulnerability in the CGI implementation in Microsoft Internet Information Services (IIS) 4.x and 5.x on Windows NT and Windows 2000 allows remote attackers to modify arbitrary uppercase environment variables via a \n (newline) character in an HTTP header.

Metrics

EPSS Probability

19.09%

97.0th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Vendor	Product	Versions
Microsoft	Internet Information Services	4.0
Microsoft	Internet Information Services	5.0

References

http://hi.baidu.com/yuange1975/item/b2cc7141c22108e91e19bc2eThird Party Advisory
http://seclists.org/fulldisclosure/2012/Apr/0Exploit, Mailing List, Third Party Advisory
http://seclists.org/fulldisclosure/2012/Apr/13Exploit, Mailing List, Third Party Advisory
http://seclists.org/fulldisclosure/2014/Apr/108Exploit, Mailing List, Third Party Advisory
http://seclists.org/fulldisclosure/2014/Apr/128Exploit, Mailing List, Third Party Advisory
http://seclists.org/fulldisclosure/2014/Apr/247Exploit, Mailing List, Third Party Advisory
http://hi.baidu.com/yuange1975/item/b2cc7141c22108e91e19bc2eThird Party Advisory
http://seclists.org/fulldisclosure/2012/Apr/0Exploit, Mailing List, Third Party Advisory
http://seclists.org/fulldisclosure/2012/Apr/13Exploit, Mailing List, Third Party Advisory
http://seclists.org/fulldisclosure/2014/Apr/108Exploit, Mailing List, Third Party Advisory
http://seclists.org/fulldisclosure/2014/Apr/128Exploit, Mailing List, Third Party Advisory
http://seclists.org/fulldisclosure/2014/Apr/247Exploit, Mailing List, Third Party Advisory

Timeline

Published: Apr 23, 2014
Last Modified: Jun 16, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2011-5279?

How severe is CVE-2011-5279?

Severity scoring for CVE-2011-5279 is pending analysis. The EPSS model estimates a 19.09% probability of exploitation in the next 30 days.

How do I fix CVE-2011-5279?

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-2011-5279?

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

Scan your code now

Source: NVD / NIST