MEDIUM
CVE-2013-1762
CWE-94Published: March 8, 2013· Updated: Jun 16, 2026
6.6
CVSS v3.1
Official Description
stunnel 4.21 through 4.54, when CONNECT protocol negotiation and NTLM authentication are enabled, does not correctly perform integer conversion, which allows remote proxy servers to execute arbitrary code via a crafted request that triggers a buffer overflow.
Technical Analysis
CVE-2013-1762 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.
Exploitation requires some privileges, which limits the exposure to scenarios where an attacker has already gained initial access.
CVSS v3.1 Vector Breakdown
Exploitability
Attack VectorNetwork
Attack ComplexityHigh
Privileges Req.
User Interaction
Scope
Impact
ConfidentialityP
IntegrityP
AvailabilityC
AV:N/AC:H/Au:N/C:P/I:P/A:C
Affected Vendors & Products
stunnel1 product(s)
stunnel
Source: NVD CPE · 34 total CPE entries
Exploit & PoC Resources
NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.
Official Patches & Advisories
All References (10)
→
https://www.stunnel.org/CVE-2013-1762.htmlVendor Advisory
→
https://www.stunnel.org/CVE-2013-1762.htmlVendor Advisory
Quick Facts
CVE IDCVE-2013-1762
CVSS Score6.6 / 10
SeverityMEDIUM
WeaknessCWE-94
CISA KEVNo
Affected1 vendor(s)
PublishedMar 8, 2013
Related CVEs (CWE-94)
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2013-1762 in threat intel feeds
- →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.