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.
CVE-2012-10053
“—” beside the score: it is equal to NVD's CVSS score.
This critical-severity CVE scores 9.3 under NVD CVSS v3. EPSS exploit probability: 1.9% (79th percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.
Also known asEUVD-2012-6582 (ENISA EUVD) · GHSA-2c3g-g985-wqv4 (GitHub Security Advisories)Source: ENISA EUVD
- Public exploit code is available (Metasploit)
No fix is confirmed yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for the fix.
- CVSS v3
- 9.3
- EG Score
- 9.3CRITICALmedium confidence
- EG Risk
- 83EG Risk 83/100
EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.
How it’s computed (value × EchelonGraph’s weight)Severity93% × 45%Impact severity (EG Severity): CVSS 9.3 of 10. Never the KEV-floored or EPSS-lifted EG Score.Exploitation65% × 40%EchelonGraph's fixed weight for EG-KEV Tier 2 (Weaponized): a constant, not a probability.Automatability100% × 15%CISA's SSVC Automatable value: yes (Vulnrichment).SSVC (CISA's decision table, applied by EchelonGraph): Track at low, Track* at medium and Attend at high mission impact.Exploitation public PoC (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.Action: No fix is confirmed yet. Check with the vendor for a fixed release; until one is applied, restrict network exposure of the affected system on your normal schedule at low or medium mission impact and sooner than that at high. - EPSS PROB
- 1.9%
- EPSS %ILE
- 79th
- KEV
- Not listed
What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)
The EG score (9.3): severity, escalated by confirmed exploitation. This CVE's 9.3 is its impact severity (EG Severity), not escalated.
- EG Severity
- 9.3 CRITICALCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.NVD CVSS v3 · CVSS v3.0 or v3.1
- EG Likelihood
- 1.9% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-11-02). FIRST's exploitation probability, not an EchelonGraph model.
- Confirmed exploitation
- None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
- EG Priority
- SSVC Track* at medium mission impactTrack at low, Track* at medium and Attend at high mission impact.CISA BOD 26-04: 3 days if the affected system is publicly exposed; 60 days if it is not.No released fix is confirmed on this page, but CISA's timeline does not wait for a fix's release: it starts when an agency identifies the flaw on an asset and updates the CDM Agency and Federal Dashboard, and the directive counts patching, decommissioning the system or another action as remediation. Until a fixed release is applied, mitigate as this page's verdict says.Each input and its source, and whom BOD 26-04 binds: the SSVC and BOD 26-04 blocks below.
SSVC (CISA's decision table, applied by EchelonGraph)Track at low, Track* at medium and Attend at high mission impact.
No fix is confirmed yet. Check with the vendor for a fixed release; until one is applied, restrict network exposure of the affected system on your normal schedule at low or medium mission impact and sooner than that at high.
Exploitation public PoC (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table
BOD 26-04 (CISA's remediation timeline, Table 1)3 days if the affected system is publicly exposed; 60 days if it is not.
No released fix is confirmed on this page, but CISA's timeline does not wait for a fix's release: it starts when an agency identifies the flaw on an asset and updates the CDM Agency and Federal Dashboard, and the directive counts patching, decommissioning the system or another action as remediation. Until a fixed release is applied, mitigate as this page's verdict says.
The score's inputs: In CISA KEV no (CISA's KEV catalog) · Automatable yes (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it
Published
August 8, 2025
Last Modified
April 15, 2026
Advisory Details (6)
Auto-updated Sep 15, 2026Simple Web Server - Connection Header Buffer Overflow (Metasploit) - Windows remote Exploit
https://www.exploit-db.com/exploits/20028Simple Web Server 2.2 rc2 - Remote Buffer Overflow - Windows remote Exploit
https://www.exploit-db.com/exploits/19937Simple Web Server Connection Header Buffer Overflow | Advisories | VulnCheck
https://www.vulncheck.com/advisories/simple-web-server-connection-header-buffer-overflowSimpleWebServer 2.2-rc2 – Remote Buffer Overflow Exploit | Ghost in the Lab
http://ghostinthelab.wordpress.com/2012/07/19/simplewebserver-2-2-rc2-remote-buffer-overflow-exploit/Weakness Classification(1)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 21× in last 7d / 71× in last 30d)
Each row is a time one of our pipelines fetched, updated or re-scored this CVE. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.
Showing the most recent 100 of 196 refreshes on record for this CVE.
A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. None are among the latest 100 rows. The 96 oldest rows on record are not shown and were not checked, so the counts can still include repeats.
- 2026-11-02 18:49 UTCEG score recompute
- 2026-11-02 18:49 UTCGHSA enrichmentGHSA-2c3g-g985-wqv4 · GitHub severity CRITICAL
- 2026-11-02 16:31 UTCEPSS rescoreEPSS 1.9% · 79th percentile
- 2026-11-01 16:54 UTCEG score recompute
- 2026-11-01 16:54 UTCGHSA enrichmentGHSA-2c3g-g985-wqv4 · GitHub severity CRITICAL
- 2026-11-01 16:26 UTCEPSS rescoreEPSS 1.9% · 79th percentile
- 2026-10-31 16:26 UTCEPSS rescoreEPSS 1.9% · 79th percentile
- 2026-10-31 15:00 UTCEG score recompute
- 2026-10-31 14:59 UTCGHSA enrichmentGHSA-2c3g-g985-wqv4 · GitHub severity CRITICAL
- 2026-10-30 16:26 UTCEPSS rescoreEPSS 1.9% · 79th percentile
- 2026-10-30 13:04 UTCEG score recompute
- 2026-10-30 13:04 UTCGHSA enrichmentGHSA-2c3g-g985-wqv4 · GitHub severity CRITICAL
- 2026-10-29 16:26 UTCEPSS rescoreEPSS 1.9% · 79th percentile
- 2026-10-29 11:08 UTCEG score recompute
- 2026-10-29 11:08 UTCGHSA enrichmentGHSA-2c3g-g985-wqv4 · GitHub severity CRITICAL
- 2026-10-28 16:26 UTCEPSS rescoreEPSS 1.7% · 77th percentile
- 2026-10-28 09:07 UTCEG score recompute
- 2026-10-28 09:07 UTCGHSA enrichmentGHSA-2c3g-g985-wqv4 · GitHub severity CRITICAL
- 2026-10-27 16:26 UTCEPSS rescoreEPSS 1.7% · 77th percentile
- 2026-10-27 06:37 UTCEG score recompute
- 2026-10-27 06:37 UTCGHSA enrichmentGHSA-2c3g-g985-wqv4 · GitHub severity CRITICAL
- 2026-10-26 16:25 UTCEPSS rescoreEPSS 1.7% · 77th percentile
- 2026-10-26 01:00 UTCGHSA enrichmentGHSA-2c3g-g985-wqv4 · GitHub severity CRITICAL
- 2026-10-25 20:13 UTCEG score recompute
- 2026-10-25 16:26 UTCEPSS rescoreEPSS 1.7% · 77th percentile
Show 75 moreShow fewer
- 2026-10-24 23:05 UTCEG score recompute
- 2026-10-24 23:05 UTCGHSA enrichmentGHSA-2c3g-g985-wqv4 · GitHub severity CRITICAL
- 2026-10-24 16:26 UTCEPSS rescoreEPSS 1.7% · 77th percentile
- 2026-10-23 21:10 UTCEG score recompute
- 2026-10-23 21:10 UTCGHSA enrichmentGHSA-2c3g-g985-wqv4 · GitHub severity CRITICAL
- 2026-10-23 16:26 UTCEPSS rescoreEPSS 1.7% · 77th percentile
- 2026-10-22 19:14 UTCEG score recompute
- 2026-10-22 19:14 UTCGHSA enrichmentGHSA-2c3g-g985-wqv4 · GitHub severity CRITICAL
- 2026-10-22 16:26 UTCEPSS rescoreEPSS 1.7% · 77th percentile
- 2026-10-21 17:18 UTCEG score recompute
- 2026-10-21 17:18 UTCGHSA enrichmentGHSA-2c3g-g985-wqv4 · GitHub severity CRITICAL
- 2026-10-21 16:26 UTCEPSS rescoreEPSS 1.7% · 77th percentile
- 2026-10-20 16:26 UTCEPSS rescoreEPSS 1.7% · 77th percentile
- 2026-10-20 15:04 UTCEG score recompute
- 2026-10-20 15:04 UTCGHSA enrichmentGHSA-2c3g-g985-wqv4 · GitHub severity CRITICAL
- 2026-10-19 16:25 UTCEPSS rescoreEPSS 1.7% · 77th percentile
- 2026-10-19 13:08 UTCEG score recompute
- 2026-10-19 13:08 UTCGHSA enrichmentGHSA-2c3g-g985-wqv4 · GitHub severity CRITICAL
- 2026-10-18 16:26 UTCEPSS rescoreEPSS 1.7% · 77th percentile
- 2026-10-18 11:11 UTCEG score recompute
- 2026-10-18 11:10 UTCGHSA enrichmentGHSA-2c3g-g985-wqv4 · GitHub severity CRITICAL
- 2026-10-17 16:26 UTCEPSS rescoreEPSS 1.7% · 77th percentile
- 2026-10-17 09:14 UTCEG score recompute
- 2026-10-17 09:14 UTCGHSA enrichmentGHSA-2c3g-g985-wqv4 · GitHub severity CRITICAL
- 2026-10-16 16:26 UTCEPSS rescoreEPSS 1.7% · 77th percentile
- 2026-10-16 07:19 UTCEG score recompute
- 2026-10-16 07:19 UTCGHSA enrichmentGHSA-2c3g-g985-wqv4 · GitHub severity CRITICAL
- 2026-10-15 16:26 UTCEPSS rescoreEPSS 1.7% · 77th percentile
- 2026-10-15 05:24 UTCEG score recompute
- 2026-10-15 05:23 UTCGHSA enrichmentGHSA-2c3g-g985-wqv4 · GitHub severity CRITICAL
- 2026-10-14 16:26 UTCEPSS rescoreEPSS 1.7% · 77th percentile
- 2026-10-14 01:05 UTCEG score recompute
- 2026-10-14 01:05 UTCGHSA enrichmentGHSA-2c3g-g985-wqv4 · GitHub severity CRITICAL
- 2026-10-13 16:26 UTCEPSS rescoreEPSS 1.7% · 77th percentile
- 2026-10-12 21:13 UTCEG score recompute
- 2026-10-12 21:13 UTCGHSA enrichmentGHSA-2c3g-g985-wqv4 · GitHub severity CRITICAL
- 2026-10-12 16:27 UTCEPSS rescoreEPSS 1.7% · 77th percentile
- 2026-10-12 01:39 UTCEG score recompute
- 2026-10-11 13:39 UTCEPSS rescoreEPSS 1.7% · 77th percentile
- 2026-10-10 19:54 UTCEPSS rescoreEPSS 1.7% · 77th percentile
- 2026-10-09 20:00 UTCEPSS rescoreEPSS 1.7% · 77th percentile
- 2026-10-08 16:34 UTCEPSS rescoreEPSS 1.7% · 77th percentile
- 2026-10-07 23:39 UTCEPSS rescoreEPSS 1.7% · 76th percentile
- 2026-10-06 15:10 UTCEPSS rescoreEPSS 1.7% · 76th percentile
- 2026-10-05 17:37 UTCEPSS rescoreEPSS 1.7% · 76th percentile
- 2026-10-04 23:16 UTCEPSS rescoreEPSS 1.7% · 76th percentile
- 2026-10-03 14:20 UTCEPSS rescoreEPSS 1.7% · 76th percentile
- 2026-09-29 08:26 UTCEG score recompute
- 2026-09-28 13:44 UTCEPSS rescoreEPSS 1.7% · 76th percentile
- 2026-09-27 13:39 UTCEPSS rescoreEPSS 1.2% · 67th percentile
- 2026-09-26 15:52 UTCEPSS rescoreEPSS 1.2% · 67th percentile
- 2026-09-24 13:57 UTCEPSS rescoreEPSS 1.2% · 66th percentile
- 2026-09-20 20:08 UTCEPSS rescoreEPSS 1.2% · 66th percentile
- 2026-09-16 13:58 UTCEPSS rescoreEPSS 1.2% · 66th percentile
- 2026-09-15 03:04 UTCEPSS rescoreEPSS 1.2% · 66th percentile
- 2026-09-13 16:40 UTCEPSS rescoreEPSS 1.2% · 66th percentile
- 2026-09-11 09:30 UTCEPSS rescoreEPSS 1.2% · 66th percentile
- 2026-09-07 15:56 UTCEPSS rescoreEPSS 1.2% · 66th percentile
- 2026-09-05 15:22 UTCEPSS rescoreEPSS 1.2% · 65th percentile
- 2026-09-04 13:55 UTCEPSS rescoreEPSS 1.2% · 66th percentile
- 2026-08-28 21:34 UTCEPSS rescoreEPSS 1.2% · 65th percentile
- 2026-08-27 14:20 UTCEPSS rescoreEPSS 1.2% · 66th percentile
- 2026-08-26 14:40 UTCEPSS rescoreEPSS 1.2% · 65th percentile
- 2026-08-23 00:12 UTCEPSS rescoreEPSS 1.2% · 65th percentile
- 2026-08-21 23:43 UTCEPSS rescoreEPSS 1.2% · 65th percentile
- 2026-08-19 16:59 UTCEPSS rescoreEPSS 1.2% · 65th percentile
- 2026-08-18 13:42 UTCEPSS rescoreEPSS 1.2% · 65th percentile
- 2026-08-16 02:09 UTCEPSS rescoreEPSS 1.2% · 65th percentile
- 2026-08-15 01:25 UTCEPSS rescoreEPSS 1.2% · 65th percentile
- 2026-08-09 13:42 UTCEPSS rescoreEPSS 1.2% · 65th percentile
- 2026-08-08 16:31 UTCEPSS rescoreEPSS 1.2% · 65th percentile
- 2026-08-07 16:21 UTCEPSS rescoreEPSS 1.2% · 65th percentile
- 2026-08-06 13:41 UTCEPSS rescoreEPSS 1.2% · 65th percentile
- 2026-08-05 19:12 UTCEPSS rescoreEPSS 1.2% · 65th percentile
- 2026-08-04 15:04 UTCEPSS rescoreEPSS 1.2% · 65th percentile
Publicly available exploits
(2 references)Public exploit code is referenced for this CVE (2 Metasploit modules). No fix is confirmed yet, so defenders should restrict or isolate affected systems accordingly until one is published.
- Metasploitexploit/windows/http/sws_connection_bof✓ verifiedPublished Jul 22, 2012
Simple Web Server Connection Header Buffer Overflow
Open source ↗ - Metasploitexploit/windows/fileformat/somplplayer_m3u✓ verifiedPublished Jun 4, 2010
S.O.M.P.L 1.0 Player Buffer Overflow
Open source ↗
Related CVEs(same CWE)
Frequently asked(5)
What is CVE-2012-10053?
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Dependency Blast Radius
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