Simple Web Server Connection Header Buffer Overflow
Published Aug 8, 2025
9.3
CRITICALCVSS 4.0
EPSS 1.73%
Description
Simple Web Server 2.2 rc2 contains a stack-based buffer overflow vulnerability in its handling of the Connection HTTP header. When a remote attacker sends an overly long string in this header, the server uses vsprintf() without proper bounds checking, leading to a buffer overflow on the stack. This flaw allows remote attackers to execute arbitrary code with the privileges of the web server process. The vulnerability is triggered before authentication.
Affected products
-
- Version 2.2 rc2StatusaffectedConstraints-
- Version
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||
|---|---|---|---|---|---|---|---|---|---|
| PMSoftware | Simple Web Server | n/a |
|
No data.
No data.
No Red Hat product state for this CVE.
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
1 other source (NVD) ▾
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
No CVSS v3.1 score for this CVE.
No CVSS v3.0 score for this CVE.
No CVSS v2.0 score for this CVE.
This CVE is not in the KEV list.
CISA SSVC (Vulnrichment)
Stakeholder-Specific Vulnerability Categorization from CISA ADP.
Exploitation
PoCAutomatable
YesTechnical Impact
TotalDecision
n/aAssessed Aug 8, 2025 · SSVC 2.0.3
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
Score over time
2025–2026- EPSS v4
- EPSS v5
Percentile over time
- EPSS v4
- EPSS v5
Table of values (7 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 1.73% (0.01727) | 76.72th | v5 (v2026.06.15) |
| Jun 15, 2026 | 1.46% (0.01462) | 70.10th | v5 (v2026.06.15) |
| Jun 4, 2026 | 76.35% (0.76348) | 98.95th | v4 (v2025.03.14) |
| Jan 4, 2026 | 65.02% (0.65015) | 98.40th | v4 (v2025.03.14) |
| Dec 8, 2025 | 72.21% (0.72213) | 98.69th | v4 (v2025.03.14) |
| Oct 8, 2025 | 69.27% (0.69265) | 98.57th | v4 (v2025.03.14) |
| Aug 9, 2025 | 0.50% (0.00499) | 64.86th | v4 (v2025.03.14) |
References (6)
- http://ghostinthelab.wordpress.com/2012/07/19/simplewebserver-2-2-rc2-remote-buffer-overflow-exploit/ technical-descriptionexploit
- http://www.pmx.it/software/sws.asp product
- https://raw.githubusercontent.com/rapid7/metasploit-framework/master/modules/exploits/windows/http/sws_connection_bof.rb exploit
- https://www.exploit-db.com/exploits/19937 exploit
- https://www.exploit-db.com/exploits/20028 exploit
- https://www.vulncheck.com/advisories/simple-web-server-connection-header-buffer-overflow third-party-advisory
Change history (0)
No recorded changes yet.