CVE-2011-5166
Knftp vulnerability
Multiple stack-based buffer overflows in KnFTP 1.0.0 allow remote attackers to execute arbitrary code via a long string to the (1) USER, (2) PASS, (3) REIN, (4) QUIT, (5) PORT, (6) PASV, (7) TYPE, (8) STRU, (9) MODE, (10) RETR, (11) STOR, (12) APPE, (13) ALLO, (14) REST, (15) RNFR, (16) RNTO, (17) ABOR, (18) DELE, (19) CWD, (20) LIST, (21) NLST, (22) SITE, (23) STST, (24) HELP, (25) NOOP, (26) MKD, (27) RMD, (28) PWD, (29) CDUP, (30) STOU, (31) SNMT, (32) SYST, and (33) XPWD commands.
CVSS vector
AV:N/AC:L/Au:N/C:P/I:P/A:P
Weakness type (CWE)
- CWE-119 — Improper Restriction of Operations within Memory Bounds
Risk analysis
Based on its CVSS vector, this vulnerability is exploitable over the network, low attack complexity, requiring no authentication. Successful exploitation leads to partial impact to confidentiality, partial impact to integrity, partial impact to availability.
Its EPSS score of 6.5% reflects a lower probability of exploitation activity in the wild over the next 30 days, placing it above 93% of all scored CVEs.
Check your external exposure to CVE-2011-5166
- Confirm whether Elif Keir Knftp is running on any internet-facing host or subdomain.
- Match discovered service fingerprints against the version affected by CVE-2011-5166.
- Prioritise remediation if the asset is public, business-critical, or near authentication/payment flows.
How ThreatPort helps with CVE-2011-5166
ThreatPort's external attack surface scanner checks your internet-facing assets — agentlessly, from the outside in — for the exposed services and versions that CVE-2011-5166 affects, then prioritises the finding by real risk using CISA KEV and FIRST.org EPSS.
Run a free external exposure scan