How severe is CVE-2002-1558?

CVE-2002-1558 has a CVSS 2.0 base score of 10.0, rated critical severity.

Is CVE-2002-1558 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (85th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2002-1558?

CVE-2002-1558 primarily affects Cisco Optical Networking Systems Software. In total, 5 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2002-1558?

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-2002-1558 published?

CVE-2002-1558 was published on 2003-03-31 and last updated on 2026-06-16.

CVE-2002-1558

CVE-2002-1558 is a critical-severity vulnerability in Cisco Optical Networking Systems Software 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: 3% (85th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Cisco Optical Networking Systems Software
Published: 2003-03-31
Last modified: 2026-06-16

Description

Cisco ONS15454 and ONS15327 running ONS before 3.4 have an account for the VxWorks Operating System in the TCC, TCC+ and XTC that cannot be changed or disabled, which allows remote attackers to gain privileges by connecting to the account via Telnet.

Frequently asked questions

What is CVE-2002-1558?: Cisco ONS15454 and ONS15327 running ONS before 3.4 have an account for the VxWorks Operating System in the TCC, TCC+ and XTC that cannot be changed or disabled, which allows remote attackers to gain privileges by connecting to the account via Telnet.
How severe is CVE-2002-1558?: CVE-2002-1558 has a CVSS 2.0 base score of 10.0, rated critical severity.
Is CVE-2002-1558 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (85th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2002-1558?: CVE-2002-1558 primarily affects Cisco Optical Networking Systems Software. In total, 5 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2002-1558?: 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-2002-1558 published?: CVE-2002-1558 was published on 2003-03-31 and last updated on 2026-06-16.

References

Affected products (5)

cpe:2.3:a:cisco:optical_networking_systems_software:3.0:*:*:*:*:*:*:*
cpe:2.3:a:cisco:optical_networking_systems_software:3.1.0:*:*:*:*:*:*:*
cpe:2.3:a:cisco:optical_networking_systems_software:3.2:*:*:*:*:*:*:*
cpe:2.3:a:cisco:optical_networking_systems_software:3.2.0:*:*:*:*:*:*:*
cpe:2.3:a:cisco:optical_networking_systems_software:3.3.0:*:*:*:*:*:*:*

More vulnerabilities in Cisco Optical Networking Systems Software

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CVE-2006-1672 — High (CVSS 7.5): The installation of Cisco Transport Controller (CTC) for Cisco Optical Networking System (ONS) 15000 series nodes adds…
CVE-2004-1436 — High (CVSS 7.5): The Transaction Language 1 (TL1) login interface in Cisco ONS 15327 4.6(0) and 4.6(1) and 15454 and 15454 SDH 4.6(0)…
CVE-2002-1553 — High (CVSS 7.5): Cisco ONS15454 and ONS15327 running ONS before 3.4 allows remote attackers to modify the system configuration and…

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