How severe is CVE-2001-0288?

CVE-2001-0288 has a CVSS 2.0 base score of 7.5, rated high severity.

Is CVE-2001-0288 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 5% (92nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2001-0288?

CVE-2001-0288 affects Cisco Ios. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2001-0288?

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-2001-0288 published?

CVE-2001-0288 was published on 2001-05-03 and last updated on 2026-06-16.

CVE-2001-0288

CVE-2001-0288 is a high-severity vulnerability in Cisco Ios 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: 5% (92nd percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Cisco Ios
Published: 2001-05-03
Last modified: 2026-06-16

Description

Cisco switches and routers running IOS 12.1 and earlier produce predictable TCP Initial Sequence Numbers (ISNs), which allows remote attackers to spoof or hijack TCP connections.

Frequently asked questions

What is CVE-2001-0288?: Cisco switches and routers running IOS 12.1 and earlier produce predictable TCP Initial Sequence Numbers (ISNs), which allows remote attackers to spoof or hijack TCP connections.
How severe is CVE-2001-0288?: CVE-2001-0288 has a CVSS 2.0 base score of 7.5, rated high severity.
Is CVE-2001-0288 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 5% (92nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2001-0288?: CVE-2001-0288 affects Cisco Ios. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2001-0288?: 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-2001-0288 published?: CVE-2001-0288 was published on 2001-05-03 and last updated on 2026-06-16.

References

http://www.cisco.com/warp/public/707/ios-tcp-isn-random-pub.shtml

Affected products (1)

cpe:2.3:o:cisco:ios:*:*:*:*:*:*:*:*

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