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Vulnerability record · CVE-2001-1135 · published 14 August 2001

CVE-2001-1135: Zyxel prestige vulnerability

Zyxel · Prestige

ZyXEL Prestige 642R and 642R-I routers do not filter the routers' Telnet and FTP ports on the external WAN interface from inside access, allowing someone on an internal computer to reconfigure the router, if the password is known.

7.5 CVSS 2.0 High EPSS 1.5% · top 26.8%
7.5CVSS 2.0 base score
1.5%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
12References
16 Jun 2026Last modified by NVD

Description

ZyXEL Prestige 642R and 642R-I routers do not filter the routers' Telnet and FTP ports on the external WAN interface from inside access, allowing someone on an internal computer to reconfigure the router, if the password is known.

AV:N/AC:L/Au:N/C:P/I:P/A:P

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://www.securityfocus.com/archive/1/203022
http://www.securityfocus.com/archive/1/203592
http://www.securityfocus.com/archive/1/204439 Vendor Advisory
http://www.securityfocus.com/archive/1/214971 Vendor Advisory
http://www.securityfocus.com/bid/3346 Vendor Advisory
https://exchange.xforce.ibmcloud.com/vulnerabilities/7146
http://www.securityfocus.com/archive/1/203022
http://www.securityfocus.com/archive/1/203592
http://www.securityfocus.com/archive/1/204439 Vendor Advisory
http://www.securityfocus.com/archive/1/214971 Vendor Advisory
http://www.securityfocus.com/bid/3346 Vendor Advisory
https://exchange.xforce.ibmcloud.com/vulnerabilities/7146

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

5.0CVE-2005-0328Netgear rt311 vulnerabilityZyxel P310, P314, P324 and Netgear RT311, RT314 running the latest firmware, allows remote attackers on the WAN to obtain the IP address of the LAN s…EPSS 1.2%5.0CVE-2004-1540Zyxel prestige vulnerabilityZyXEL Prestige 623, 650, and 652 HW Routers, and possibly other versions, with HTTP Remote Administration enabled, does not require a password to acc…EPSS 6.6%5.0CVE-2004-1684Zyxel prestige vulnerabilityZyxel P681 running ZyNOS Vt020225a contains portions of memory in an ARP request, which allows remote attackers to obtain sensitive information by sn…EPSS 1.4%5.0CVE-2004-0670Zyxel prestige vulnerabilityPrestige 650HW-31 running Rompager 4.7 software allows remote attackers to cause a denial of service (device reboot) via a long password.EPSS 1.6%5.0CVE-2002-1071Zyxel prestige vulnerabilityZyXEL Prestige 642R allows remote attackers to cause a denial of service in the Telnet, FTP, and DHCP services (crash) via a TCP packet with both the…EPSS 3.3%5.0CVE-2002-1072Zyxel prestige vulnerabilityZyXEL Prestige 642R 2.50(FA.1) and Prestige 310 V3.25(M.01), allows remote attackers to cause a denial of service via an oversized, fragmented "jolt"…EPSS 3.2%

Source: NIST National Vulnerability Database (record CVE-2001-1135), CISA KEV, FIRST EPSS (scores of 2026-09-28). This page is refreshed as NVD updates the record.