How severe is CVE-2004-1436?

CVE-2004-1436 has a CVSS 2.0 base score of 7.5, rated high severity.

Is CVE-2004-1436 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (86th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2004-1436?

CVE-2004-1436 primarily affects Cisco Optical Networking Systems Software. In total, 23 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2004-1436?

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-2004-1436 published?

CVE-2004-1436 was published on 2004-12-31 and last updated on 2026-06-16.

CVE-2004-1436

CVE-2004-1436 is a high-severity vulnerability in Cisco Optical Networking Systems Software 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: 3% (86th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Cisco Optical Networking Systems Software
Published: 2004-12-31
Last modified: 2026-06-16

Description

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) and 4.6(1), when a user account is configured with a blank password, allows remote attackers to gain unauthorized access by logging in with a password larger than 10 characters.

Frequently asked questions

What is CVE-2004-1436?: 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) and 4.6(1), when a user account is configured with a blank password, allows remote attackers to gain unauthorized access by logging in with a password larger than 10 characters.
How severe is CVE-2004-1436?: CVE-2004-1436 has a CVSS 2.0 base score of 7.5, rated high severity.
Is CVE-2004-1436 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (86th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2004-1436?: CVE-2004-1436 primarily affects Cisco Optical Networking Systems Software. In total, 23 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2004-1436?: 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-2004-1436 published?: CVE-2004-1436 was published on 2004-12-31 and last updated on 2026-06-16.

References

Affected products (23)

cpe:2.3:a:cisco:optical_networking_systems_software:1.0:*:*:*:*:*:*:*
cpe:2.3:a:cisco:optical_networking_systems_software:1.1:*:*:*:*:*:*:*
cpe:2.3:a:cisco:optical_networking_systems_software:1.1\(0\):*:*:*:*:*:*:*
cpe:2.3:a:cisco:optical_networking_systems_software:1.1\(1\):*:*:*:*:*:*:*
cpe:2.3:a:cisco:optical_networking_systems_software:1.3\(0\):*:*:*:*:*:*:*
cpe:2.3:a:cisco:optical_networking_systems_software:2.3\(5\):*:*:*:*:*:*:*
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:*:*:*:*:*:*:*
cpe:2.3:a:cisco:optical_networking_systems_software:3.4.0:*:*:*:*:*:*:*
cpe:2.3:a:cisco:optical_networking_systems_software:4.0\(0\):*:*:*:*:*:*:*
cpe:2.3:a:cisco:optical_networking_systems_software:4.0\(1\):*:*:*:*:*:*:*
cpe:2.3:a:cisco:optical_networking_systems_software:4.0\(2\):*:*:*:*:*:*:*
cpe:2.3:a:cisco:optical_networking_systems_software:4.0.0:*:*:*:*:*:*:*
cpe:2.3:a:cisco:optical_networking_systems_software:4.1\(0\):*:*:*:*:*:*:*
cpe:2.3:a:cisco:optical_networking_systems_software:4.1\(1\):*:*:*:*:*:*:*
cpe:2.3:a:cisco:optical_networking_systems_software:4.1\(2\):*:*:*:*:*:*:*
cpe:2.3:a:cisco:optical_networking_systems_software:4.1\(3\):*:*:*:*:*:*:*
cpe:2.3:a:cisco:optical_networking_systems_software:4.5:*:*:*:*:*:*:*
cpe:2.3:a:cisco:optical_networking_systems_software:4.6\(0\):*:*:*:*:*:*:*
cpe:2.3:a:cisco:optical_networking_systems_software:4.6\(1\):*:*:*:*:*:*:*

More vulnerabilities in Cisco Optical Networking Systems Software

CVE-2004-0308 — Critical (CVSS 10.0): Unknown vulnerability in Cisco ONS 15327 before 4.1(3), ONS 15454 before 4.6(1), ONS 15454 SD before 4.1(3), and Cisco…
CVE-2002-1558 — Critical (CVSS 10.0): Cisco ONS15454 and ONS15327 running ONS before 3.4 have an account for the VxWorks Operating System in the TCC, TCC+…
CVE-2006-1670 — High (CVSS 7.8): Control cards for Cisco Optical Networking System (ONS) 15000 series nodes before 20060405 allow remote attackers to…
CVE-2003-0567 — High (CVSS 7.8): Cisco IOS 11.x and 12.0 through 12.2 allows remote attackers to cause a denial of service (traffic block) by sending a…
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-2002-1553 — High (CVSS 7.5): Cisco ONS15454 and ONS15327 running ONS before 3.4 allows remote attackers to modify the system configuration and…

All CVEs affecting Cisco Optical Networking Systems Software →