How severe is CVE-2003-0567?

CVE-2003-0567 has a CVSS 2.0 base score of 7.8, rated high severity.

Is CVE-2003-0567 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 17% (97th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2003-0567?

CVE-2003-0567 primarily affects Cisco Optical Networking Systems Software. In total, 176 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2003-0567?

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-2003-0567 published?

CVE-2003-0567 was published on 2003-08-18 and last updated on 2026-06-16.

CVE-2003-0567

CVE-2003-0567 is a high-severity vulnerability in Cisco Optical Networking Systems Software with a CVSS 2.0 base score of 7.8. Its EPSS exploit-prediction score of 17% places it in the 97th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-20.

Key facts

Severity: High (CVSS 2.0 base score 7.8)
EPSS exploit prediction: 17% (97th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-20
Affected product: Cisco Optical Networking Systems Software
Published: 2003-08-18
Last modified: 2026-06-16

Description

Cisco IOS 11.x and 12.0 through 12.2 allows remote attackers to cause a denial of service (traffic block) by sending a particular sequence of IPv4 packets to an interface on the device, causing the input queue on that interface to be marked as full.

Frequently asked questions

What is CVE-2003-0567?: Cisco IOS 11.x and 12.0 through 12.2 allows remote attackers to cause a denial of service (traffic block) by sending a particular sequence of IPv4 packets to an interface on the device, causing the input queue on that interface to be marked as full.
How severe is CVE-2003-0567?: CVE-2003-0567 has a CVSS 2.0 base score of 7.8, rated high severity.
Is CVE-2003-0567 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 17% (97th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2003-0567?: CVE-2003-0567 primarily affects Cisco Optical Networking Systems Software. In total, 176 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2003-0567?: 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-2003-0567 published?: CVE-2003-0567 was published on 2003-08-18 and last updated on 2026-06-16.

References

Affected products (176)

cpe:2.3:o:cisco:ios:11.0:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:11.1:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:11.1aa:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:11.1ca:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:11.1cc:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:11.2:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:11.2p:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:11.2sa:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:11.3:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:11.3t:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.0:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.0da:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.0db:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.0dc:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.0s:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.0sc:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.0sl:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.0sp:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.0st:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.0sx:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.0sy:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.0sz:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.0t:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.0w5:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.0wc:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.0wt:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.0xa:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.0xb:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.0xc:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.0xd:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.0xe:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.0xf:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.0xg:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.0xh:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.0xi:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.0xj:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.0xk:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.0xl:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.0xm:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.0xn:*:*:*:*:*:*:*

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