How severe is CVE-2001-1135?

CVE-2001-1135 has a CVSS 2.0 base score of 7.5, rated high severity.

Is CVE-2001-1135 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (71st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2001-1135?

CVE-2001-1135 affects Zyxel Prestige. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2001-1135?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2001-1135 published?

CVE-2001-1135 was published on 2001-08-14 and last updated on 2026-06-16.

CVE-2001-1135

CVE-2001-1135 is a high-severity vulnerability in Zyxel Prestige with a CVSS 2.0 base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: High (CVSS 2.0 base score 7.5)
EPSS exploit prediction: 1% (71st percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Zyxel Prestige
Published: 2001-08-14
Last modified: 2026-06-16

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.

Frequently asked questions

What is CVE-2001-1135?: 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.
How severe is CVE-2001-1135?: CVE-2001-1135 has a CVSS 2.0 base score of 7.5, rated high severity.
Is CVE-2001-1135 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (71st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2001-1135?: CVE-2001-1135 affects Zyxel Prestige. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2001-1135?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2001-1135 published?: CVE-2001-1135 was published on 2001-08-14 and last updated on 2026-06-16.

References

Affected products (1)

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

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