Stunnel: buffer overflow vulnerability due to incorrect integer conversion in the NTLM authentication of the CONNECT protocol negotiation
Published Mar 8, 2013
6.6
MEDIUMCVSS 2.0
EPSS 2.93%
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.
Affected products
No data.
- ≤ 4.54
- 4.21
- 4.22
- 4.23
- 4.24
- 4.25
- 4.26
- 4.27
- 4.28
- 4.29
- 4.30
- 4.31
- 4.32
- 4.33
- 4.34
- 4.35
- 4.36
- 4.37
- 4.38
- 4.39
- 4.40
- 4.41
- 4.42
- 4.43
- 4.44
- 4.45
- 4.46
- 4.47
- 4.48
- 4.49
- 4.50
- 4.51
- 4.52
- 4.53
No data.
Red Hat Enterprise Linux 6
stunnel-0:4.29-3.el6_4
Fixed · RHSA-2013:0714
Red Hat Enterprise Linux 5
stunnel
Not affected
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 6 | stunnel-0:4.29-3.el6_4 | Fixed | RHSA-2013:0714 |
| Red Hat Enterprise Linux 5 | stunnel | Not affected | n/a |
No package ranges for this CVE.
Remediation
Red Hat statement
This issue did not affect the version of the stunnel package as shipped with Red Hat Enterprise Linux 5.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
No CVSS v3.0 score for this CVE.
AV:N/AC:H/Au:N/C:P/I:P/A:C
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 3, 2026.
Score over time
2022–2026- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (11 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 3, 2026 | 2.93% (0.02932) | 86.63th | v5 (v2026.06.15) |
| Jun 15, 2026 | 2.93% (0.02932) | 85.24th | v5 (v2026.06.15) |
| Mar 30, 2025 | 2.01% (0.02010) | 82.10th | v4 (v2025.03.14) |
| Mar 29, 2025 | 3.32% (0.03317) | 78.56th | v4 (v2025.03.14) |
| Mar 17, 2025 | 1.84% (0.01842) | 81.79th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.95% (0.00953) | 83.89th | v3 (v2023.03.01) |
| Apr 1, 2024 | 0.95% (0.00953) | 82.88th | v3 (v2023.03.01) |
| Mar 7, 2023 | 1.11% (0.01113) | 82.30th | v3 (v2023.03.01) |
| Mar 6, 2023 | 2.92% (0.02920) | 83.31th | v2 (v2022.01.01) |
| Apr 1, 2022 | 2.92% (0.02920) | 81.60th | v2 (v2022.01.01) |
| Feb 4, 2022 | 2.92% (0.02920) | 64.09th | v2 (v2022.01.01) |
References (9)
- http://rhn.redhat.com/errata/RHSA-2013-0714.html vendor-advisoryx_refsource_REDHAT
- http://www.debian.org/security/2013/dsa-2664 vendor-advisoryx_refsource_DEBIAN
- http://www.mandriva.com/security/advisories?name=MDVSA-2013:130 vendor-advisoryx_refsource_MANDRIVA
- https://access.redhat.com/security/cve/CVE-2013-1762 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=917839 Issue Tracking
- https://nvd.nist.gov/vuln/detail/CVE-2013-1762
- https://wiki.mageia.org/en/Support/Advisories/MGASA-2013-0097 x_refsource_CONFIRM
- https://www.cve.org/CVERecord?id=CVE-2013-1762
- https://www.stunnel.org/CVE-2013-1762.html x_refsource_CONFIRMVendor Advisory
| Link | Providers | Tags |
|---|---|---|
| http://rhn.redhat.com/errata/RHSA-2013-0714.html | vendor-advisoryx_refsource_REDHAT | |
| http://www.debian.org/security/2013/dsa-2664 | vendor-advisoryx_refsource_DEBIAN | |
| http://www.mandriva.com/security/advisories?name=MDVSA-2013:130 | vendor-advisoryx_refsource_MANDRIVA | |
| https://access.redhat.com/security/cve/CVE-2013-1762 | Vendor Advisory | |
| https://bugzilla.redhat.com/show_bug.cgi?id=917839 | Issue Tracking | |
| https://nvd.nist.gov/vuln/detail/CVE-2013-1762 | ||
| https://wiki.mageia.org/en/Support/Advisories/MGASA-2013-0097 | x_refsource_CONFIRM | |
| https://www.cve.org/CVERecord?id=CVE-2013-1762 | ||
| https://www.stunnel.org/CVE-2013-1762.html | x_refsource_CONFIRMVendor Advisory |
Change history (0)
No recorded changes yet.