stunnel: heap corruption flaw in 4.4x leads to remote DoS and possible code execution
Published Aug 25, 2011
9.3
HIGHCVSS 2.0
EPSS 5.71%
Description
stunnel 4.40 and 4.41 might allow remote attackers to execute arbitrary code or cause a denial of service (heap memory corruption) via unspecified vectors.
Affected products
No data.
No data.
Red Hat Enterprise Linux 4
stunnel
Not affected
Red Hat Enterprise Linux 5
stunnel
Not affected
Red Hat Enterprise Linux 6
stunnel
Not affected
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 4 | stunnel | Not affected | n/a |
| Red Hat Enterprise Linux 5 | stunnel | Not affected | n/a |
| Red Hat Enterprise Linux 6 | stunnel | Not affected | n/a |
No package ranges for this CVE.
Remediation
Red Hat statement
Not vulnerable. This issue did not affect the versions of stunnel as shipped with Red Hat Enterprise Linux 4, 5, or 6.
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:M/Au:N/C:C/I:C/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 1, 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 (14 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 5.71% (0.05711) | 92.79th | v5 (v2026.06.15) |
| Jun 15, 2026 | 5.71% (0.05711) | 92.01th | v5 (v2026.06.15) |
| Feb 24, 2026 | 15.84% (0.15844) | 94.60th | v4 (v2025.03.14) |
| Mar 30, 2025 | 12.76% (0.12759) | 93.38th | v4 (v2025.03.14) |
| Mar 29, 2025 | 31.09% (0.31093) | 94.88th | v4 (v2025.03.14) |
| Mar 19, 2025 | 12.76% (0.12759) | 93.14th | v4 (v2025.03.14) |
| Mar 17, 2025 | 9.01% (0.09008) | 92.00th | v4 (v2025.03.14) |
| Dec 12, 2024 | 4.48% (0.04478) | 92.75th | v3 (v2023.03.01) |
| Apr 14, 2024 | 4.48% (0.04478) | 92.32th | v3 (v2023.03.01) |
| Feb 23, 2024 | 4.25% (0.04245) | 91.99th | v3 (v2023.03.01) |
| Mar 7, 2023 | 4.06% (0.04064) | 90.75th | v3 (v2023.03.01) |
| Mar 6, 2023 | 6.60% (0.06604) | 91.53th | v2 (v2022.01.01) |
| Apr 1, 2022 | 6.60% (0.06604) | 90.72th | v2 (v2022.01.01) |
| Feb 4, 2022 | 6.60% (0.06604) | 78.62th | v2 (v2022.01.01) |
References (13)
- http://secunia.com/advisories/45705 third-party-advisoryx_refsource_SECUNIAVendor Advisory
- http://securitytracker.com/id?1025959 vdb-entryx_refsource_SECTRACK
- http://stunnel.org/?page=sdf_ChangeLog x_refsource_CONFIRM
- http://www.openwall.com/lists/oss-security/2011/08/19/18 mailing-listx_refsource_MLIST
- http://www.openwall.com/lists/oss-security/2011/08/19/6 mailing-listx_refsource_MLIST
- http://www.osvdb.org/74600 vdb-entryx_refsource_OSVDB
- http://www.securityfocus.com/bid/49254 vdb-entryx_refsource_BID
- http://www.stunnel.org/pipermail/stunnel-announce/2011-August/000059.html mailing-listx_refsource_MLIST
- https://access.redhat.com/security/cve/CVE-2011-2940 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=732068 x_refsource_CONFIRMIssue Tracking
- https://exchange.xforce.ibmcloud.com/vulnerabilities/69318 vdb-entryx_refsource_XF
- https://nvd.nist.gov/vuln/detail/CVE-2011-2940
- https://www.cve.org/CVERecord?id=CVE-2011-2940
| Link | Providers | Tags |
|---|---|---|
| http://secunia.com/advisories/45705 | third-party-advisoryx_refsource_SECUNIAVendor Advisory | |
| http://securitytracker.com/id?1025959 | vdb-entryx_refsource_SECTRACK | |
| http://stunnel.org/?page=sdf_ChangeLog | x_refsource_CONFIRM | |
| http://www.openwall.com/lists/oss-security/2011/08/19/18 | mailing-listx_refsource_MLIST | |
| http://www.openwall.com/lists/oss-security/2011/08/19/6 | mailing-listx_refsource_MLIST | |
| http://www.osvdb.org/74600 | vdb-entryx_refsource_OSVDB | |
| http://www.securityfocus.com/bid/49254 | vdb-entryx_refsource_BID | |
| http://www.stunnel.org/pipermail/stunnel-announce/2011-August/000059.html | mailing-listx_refsource_MLIST | |
| https://access.redhat.com/security/cve/CVE-2011-2940 | Vendor Advisory | |
| https://bugzilla.redhat.com/show_bug.cgi?id=732068 | x_refsource_CONFIRMIssue Tracking | |
| https://exchange.xforce.ibmcloud.com/vulnerabilities/69318 | vdb-entryx_refsource_XF | |
| https://nvd.nist.gov/vuln/detail/CVE-2011-2940 | ||
| https://www.cve.org/CVERecord?id=CVE-2011-2940 |
Change history (0)
No recorded changes yet.