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Vulnerability record · CVE-2002-1071 · published 4 October 2002

CVE-2002-1071: Zyxel prestige vulnerability

Zyxel · Prestige

ZyXEL 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 SYN and ACK flags set.

5.0 CVSS 2.0 Medium EPSS 3.3% · top 11.9%
5.0CVSS 2.0 base score
3.3%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
10References, 2 tagged exploit
16 Jun 2026Last modified by NVD

Description

ZyXEL 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 SYN and ACK flags set.

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

Affected products

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

References

LinkTags
http://online.securityfocus.com/archive/1/277242
http://online.securityfocus.com/archive/1/277303
http://online.securityfocus.com/archive/1/277307
http://www.iss.net/security_center/static/9372.php PatchVendor Advisory
http://www.securityfocus.com/bid/5034 ExploitPatchVendor Advisory
http://online.securityfocus.com/archive/1/277242
http://online.securityfocus.com/archive/1/277303
http://online.securityfocus.com/archive/1/277307
http://www.iss.net/security_center/static/9372.php PatchVendor Advisory
http://www.securityfocus.com/bid/5034 ExploitPatchVendor Advisory

Track CVE-2002-1071 inside VULONE

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Related vulnerabilities

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

7.5CVE-2001-1135Zyxel prestige vulnerabilityZyXEL Prestige 642R and 642R-I routers do not filter the routers' Telnet and FTP ports on the external WAN interface from inside access, allowing som…EPSS 1.5%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-2002-1072Zyxel 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-2002-1071), CISA KEV, FIRST EPSS (scores of 2026-09-28). This page is refreshed as NVD updates the record.