CVE-2011-5279
CRLF injection vulnerability in the CGI implementation in Microsoft Internet Information Services...
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.
Exploit likelihood
What each source reports
NVD Score used
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.
- Record
CVE-2011-5279- CVSS 2.0
- 5.0 Medium
AV:N/AC:L/Au:N/C:N/I:P/A:N - Updated
- 2026-11-02
CVE List No score
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.
- Record
CVE-2011-5279- Updated
- 2026-11-02
EUVDEUVD-2011-5178 No score
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.
- Record
EUVD-2011-5178- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-qgmx-m7r8-pq37 No score
CRLF injection vulnerability in the CGI implementation in Microsoft Internet Information Services...
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.
- Record
GHSA-qgmx-m7r8-pq37- Updated
- 2026-11-02
Affected products
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2011-5279 is a medium vulnerability (CVSS 5.0) in Microsoft Internet Information Services, published April 23, 2014. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 19.6%, the 97th percentile. No source names a fixed version.
References
seclists.org/fulldisclosure/2014/Apr/247
hi.baidu.com/yuange1975/item/b2cc7141c22108e91e19bc2e
nvd.nist.gov/vuln/detail/CVE-2011-5279
github.com/advisories/GHSA-qgmx-m7r8-pq37