The telnet server for 3Com hardware such as PS40 SuperStack II does not delay or disconnect remote attackers who provide an incorrect usern…

published 2001-07-12 25 y ago modified 2026-06-16 4 mo ago also EUVD-2001-1272

cvss: 9.8; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 8.9%; EPSS 8.9% chance of exploitation in 30 days, percentile 95%
public exploits: 1; Exploit-DB

The telnet server for 3Com hardware such as PS40 SuperStack II does not delay or disconnect remote attackers who provide an incorrect username or password, which makes it easier to break into the server via brute force password guessing.

Timeline

2001-07-12 First public exploit (EDB-21011)
2001-07-12 Published

Exploit prediction

8.90% chance of exploitation in the next 30 days, higher than 95% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

EDB-21011 3Com SuperStack II PS Hub 40 - TelnetD Weak Password Protection remote, 2001-07-12
securityfocus.com http://www.securityfocus.com/bid/3034 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
NVD	3.1	9.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD	2.0	10.0	AV:N/AC:L/Au:N/C:C/I:C/A:C

Classification

Weakness

CWE-307 Improper Restriction of Excessive Authentication Attempts

References

securityfocus.com /bid/3034
vdb-entry, broken-link, exploit, third-party-advisory, vendor-advisory
securityfocus.com /archive/1/196957
mailing-list, broken-link, third-party-advisory, vdb-entry, vendor-advisory
exchange.xforce.ibmcloud.com /vulnerabilities/6855
vdb-entry, third-party-advisory

Sources

CVE List CVE-2001-1291
NVD CVE-2001-1291

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary