How severe is CVE-2002-1071?

CVE-2002-1071 has a CVSS 2.0 base score of 5.0, rated medium severity.

Is CVE-2002-1071 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (87th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2002-1071?

CVE-2002-1071 primarily affects Zyxel Prestige. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2002-1071?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2002-1071 published?

CVE-2002-1071 was published on 2002-10-04 and last updated on 2026-06-16.

CVE-2002-1071

CVE-2002-1071 is a medium-severity vulnerability in Zyxel Prestige with a CVSS 2.0 base score of 5.0. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: Medium (CVSS 2.0 base score 5.0)
EPSS exploit prediction: 3% (87th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Zyxel Prestige
Published: 2002-10-04
Last modified: 2026-06-16

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.

Frequently asked questions

What is CVE-2002-1071?: 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.
How severe is CVE-2002-1071?: CVE-2002-1071 has a CVSS 2.0 base score of 5.0, rated medium severity.
Is CVE-2002-1071 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (87th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2002-1071?: CVE-2002-1071 primarily affects Zyxel Prestige. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2002-1071?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2002-1071 published?: CVE-2002-1071 was published on 2002-10-04 and last updated on 2026-06-16.

References

Affected products (2)

cpe:2.3:h:zyxel:prestige:310:*:*:*:*:*:*:*
cpe:2.3:h:zyxel:prestige:642r:*:*:*:*:*:*:*

More vulnerabilities in Zyxel Prestige

CVE-2001-1135 — High (CVSS 7.5): ZyXEL Prestige 642R and 642R-I routers do not filter the routers' Telnet and FTP ports on the external WAN interface…
CVE-2005-0328 — Medium (CVSS 5.0): Zyxel P310, P314, P324 and Netgear RT311, RT314 running the latest firmware, allows remote attackers on the WAN to…
CVE-2004-1540 — Medium (CVSS 5.0): ZyXEL Prestige 623, 650, and 652 HW Routers, and possibly other versions, with HTTP Remote Administration enabled, does…
CVE-2004-1684 — Medium (CVSS 5.0): Zyxel P681 running ZyNOS Vt020225a contains portions of memory in an ARP request, which allows remote attackers to…
CVE-2004-0670 — Medium (CVSS 5.0): Prestige 650HW-31 running Rompager 4.7 software allows remote attackers to cause a denial of service (device reboot)…
CVE-2002-1072 — Medium (CVSS 5.0): ZyXEL Prestige 642R 2.50(FA.1) and Prestige 310 V3.25(M.01), allows remote attackers to cause a denial of service via…

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