Assessment
Why it matters
CISA lists this vulnerability as known to be exploited; exploitation is confirmed; EPSS is 99.8%; technical severity is CVSS 9.8.
Buffer overflow in the ScStoragePathFromUrl function in the WebDAV service in Internet Information Services (IIS) 6.0 in Microsoft Windows Server 2003 R2 allows remote attackers to execute arbitrary code via a long header beginning with "If: <http://" in a PROPFIND request, as exploited in the wild in July or August 2016.
Who should care
- Teams operating Internet Information Services, Internet Information Services (IIS)
- Vulnerability and exposure management teams
- Security operations teams monitoring exploitation activity
Response plan
What I would do
- Confirm whether Internet Information Services, Internet Information Services (IIS) is present in the environment.
- Identify affected versions and establish whether vulnerable services are exposed or reachable.
- Apply updates per vendor instructions.
- Review relevant security telemetry for evidence of attempted or successful exploitation.
- Document the remediation decision and track it to verified completion.
Vendor remediation
Patch and remediation links
Use the vendor source below to confirm the correct fixed version, package or mitigation for your affected product.
Technical details
- CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- CWE
- CWE-119
- Affected versions
- Microsoft Internet Information Services (Version: 6.0); Microsoft Internet Information Services (IIS)
- Published
- 27 March 2017
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
Signal timeline
- CVE published
- Added to CISA KEV
- Latest EPSS score: 99.8%
- Signal calculated at 85
External references
- Government advisory from www.cisa.gov
- Third-party advisory from www.securityfocus.com
- Third-party advisory from www.securitytracker.com
- Exploit information from github.com
- Third-party advisory from github.com
- Exploit information from medium.com
- Exploit information from www.exploit-db.com
- Exploit information from www.exploit-db.com