How severe is CVE-2000-1055?

CVE-2000-1055 has a CVSS 2.0 base score of 10.0, rated critical severity.

Is CVE-2000-1055 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 4% (89th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2000-1055?

CVE-2000-1055 primarily affects Cisco Secure Access Control Server. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2000-1055?

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

When was CVE-2000-1055 published?

CVE-2000-1055 was published on 2000-12-11 and last updated on 2026-06-16.

CVE-2000-1055

CVE-2000-1055 is a critical-severity vulnerability in Cisco Secure Access Control Server with a CVSS 2.0 base score of 10.0. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: Critical (CVSS 2.0 base score 10.0)
EPSS exploit prediction: 4% (89th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Cisco Secure Access Control Server
Published: 2000-12-11
Last modified: 2026-06-16

Description

Buffer overflow in CiscoSecure ACS Server 2.4(2) and earlier allows remote attackers to cause a denial of service and possibly execute arbitrary commands via a large TACACS+ packet.

Frequently asked questions

What is CVE-2000-1055?: Buffer overflow in CiscoSecure ACS Server 2.4(2) and earlier allows remote attackers to cause a denial of service and possibly execute arbitrary commands via a large TACACS+ packet.
How severe is CVE-2000-1055?: CVE-2000-1055 has a CVSS 2.0 base score of 10.0, rated critical severity.
Is CVE-2000-1055 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 4% (89th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2000-1055?: CVE-2000-1055 primarily affects Cisco Secure Access Control Server. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2000-1055?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2000-1055 published?: CVE-2000-1055 was published on 2000-12-11 and last updated on 2026-06-16.

References

Affected products (3)

cpe:2.3:a:cisco:secure_access_control_server:2.1:*:windows_nt:*:*:*:*:*
cpe:2.3:a:cisco:secure_access_control_server:2.3\(3\):*:windows_nt:*:*:*:*:*
cpe:2.3:a:cisco:secure_access_control_server:2.4\(2\):*:windows_nt:*:*:*:*:*

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