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CVE-2013-1762

18
FAUCET Score

CVE-2013-1762 describes a buffer overflow vulnerability in stunnel versions 4.21 through 4.54. This flaw occurs when CONNECT protocol negotiation and NTLM authentication are enabled, allowing remote proxy servers to execute arbitrary code through a crafted request due to incorrect integer conversion. The vulnerability has a CVSS score of 6.6, indicating a network-based attack with high complexity, leading to partial confidentiality, partial integrity, and complete availability impact. There is no evidence of active exploitation, publicly available exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
<= 4.54CPE matchmatch criteria
cpe:2.3:a:stunnel:stunnel:*:*:*:*:*:*:*:*
4.21CPE matchmatch criteria
cpe:2.3:a:stunnel:stunnel:4.21:*:*:*:*:*:*:*
4.22CPE matchmatch criteria
cpe:2.3:a:stunnel:stunnel:4.22:*:*:*:*:*:*:*
4.23CPE matchmatch criteria
cpe:2.3:a:stunnel:stunnel:4.23:*:*:*:*:*:*:*
4.24CPE matchmatch criteria
cpe:2.3:a:stunnel:stunnel:4.24:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

6.6MEDIUM

AV:N/AC:H/Au:N/C:P/I:P/A:C

Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
COMPLETE
Access Vector
NETWORK
Access Complexity
HIGH
Authentication
NONE
Exploitability Score
4.9
Impact Score
8.5
CvssVersion
2.0

Exploit Intelligence

EPSS Score
2.93%
Probability of exploitation in next 30 days
EPSS Percentile
85.6%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0293 is in the 78th percentile among its peer group of 19,956 CVEs.

Social Chatter

No social media mentions found for this CVE.

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (1)

redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 6Fixed in: stunnel-0:4.29-3.el6_4
View patch

Vendor Advisories (1)

redhatCVE-2013-1762Moderate

Stunnel: buffer overflow vulnerability due to incorrect integer conversion in the NTLM authentication of the CONNECT protocol negotiation

Mar 3, 2013

References

rhn.redhat.com / errata/RHSA-2013-0714.html
wiki.mageia.org / en/Support/Advisories/MGASA-2013-0097
stunnel.org / CVE-2013-1762.html
Vendor Advisory
debian.org / security/2013/dsa-2664
mandriva.com / security/advisories