How severe is CVE-2004-0306?

CVE-2004-0306 has a CVSS 2.0 base score of 5.0, rated medium severity.

Is CVE-2004-0306 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (80th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2004-0306?

CVE-2004-0306 primarily affects Cisco Optical Networking Systems Software. In total, 10 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2004-0306?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2004-0306 published?

CVE-2004-0306 was published on 2004-11-23 and last updated on 2026-06-16.

CVE-2004-0306

CVE-2004-0306 is a medium-severity vulnerability in Cisco Optical Networking Systems Software with a CVSS 2.0 base score of 5.0. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: Medium (CVSS 2.0 base score 5.0)
EPSS exploit prediction: 2% (80th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Cisco Optical Networking Systems Software
Published: 2004-11-23
Last modified: 2026-06-16

Description

Cisco ONS 15327 before 4.1(3), ONS 15454 before 4.6(1), ONS 15454 SD before 4.1(3), and Cisco ONS 15600 before 1.3(0) enable TFTP service on UDP port 69 by default, which allows remote attackers to GET or PUT ONS system files on the current active TCC in the /flash0 or /flash1 directories.

Frequently asked questions

What is CVE-2004-0306?: Cisco ONS 15327 before 4.1(3), ONS 15454 before 4.6(1), ONS 15454 SD before 4.1(3), and Cisco ONS 15600 before 1.3(0) enable TFTP service on UDP port 69 by default, which allows remote attackers to GET or PUT ONS system files on the current active TCC in the /flash0 or /flash1 directories.
How severe is CVE-2004-0306?: CVE-2004-0306 has a CVSS 2.0 base score of 5.0, rated medium severity.
Is CVE-2004-0306 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (80th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2004-0306?: CVE-2004-0306 primarily affects Cisco Optical Networking Systems Software. In total, 10 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2004-0306?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2004-0306 published?: CVE-2004-0306 was published on 2004-11-23 and last updated on 2026-06-16.

References

Affected products (10)

cpe:2.3:a:cisco:optical_networking_systems_software:1.0:*:*:*:*:*:*:*
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:4.1.0:*:*:*:*:*:*:*
cpe:2.3:a:cisco:optical_networking_systems_software:4.5:*:*:*:*:*:*:*

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-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)…

All CVEs affecting Cisco Optical Networking Systems Software →