Solar FTP Server fails to properly handle format strings passed to the USER command. When a specially crafted string containing format specifiers is sent, the server crashes due to a read access violation in the __output_1() function of sfsservice.exe. This results in a denial of service (DoS) condition.
CVE-2011-10029
This high-severity CVE scores 8.7 under NVD CVSS v3. EPSS exploit probability: 0.7%, top 50% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).
- High severity, but no confirmed exploitation yet
No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.
- CVSS v3
- 8.7
- EG Score
- 8.7(medium)
- EG Risk
- —
- EPSS
- 50.2%
- KEV
- Not listed
Published
August 20, 2025
Last Modified
April 15, 2026
References (5)
- disclosure@vulncheckhttps://raw.githubusercontent.com/rapid7/metasploit-framework/master/modules/auxiliary/dos/windows/ftp/solarftp_user.rb
- disclosure@vulncheckhttps://web.archive.org/web/20111009122553/http://solarftp.com/blog/news/solar-ftp-server-2-1-2.html
- disclosure@vulncheckhttps://web.archive.org/web/20111102141514/https://solarftp.com/
- disclosure@vulncheckhttps://www.exploit-db.com/exploits/16204
- disclosure@vulncheckhttps://www.vulncheck.com/advisories/solar-ftp-server-malformed-user-dos
Weakness Classification(1)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 9× in last 7d / 39× in last 30d)
Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. 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. Most recent first.
- 2026-07-22 21:47 UTCEG score recompute
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- 2026-06-08 15:40 UTCEG score recompute▲ 8.70
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Publicly available exploits
(1 reference)Working exploit code is in the public domain (1 Metasploit module). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.
- Metasploitauxiliary/dos/windows/ftp/solarftp_user✓ verifiedFirst seen Feb 22, 2011
Solar FTP Server Malformed USER Denial of Service
Open source ↗
Related CVEs(same CWE)
Same CWE
10 shownCWE-134
Frequently asked(5)
What is CVE-2011-10029?
When was CVE-2011-10029 disclosed?
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What is the CVSS score of CVE-2011-10029?
How do I remediate CVE-2011-10029?
Dependency Blast Radius
Explore the affected products and dependency analysis for CVE-2011-10029
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