How severe is CVE-2008-3803?

CVE-2008-3803 has a CVSS 2.0 base score of 5.1, rated medium severity.

Is CVE-2008-3803 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (84th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2008-3803?

CVE-2008-3803 primarily affects Cisco Ios. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2008-3803?

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

When was CVE-2008-3803 published?

CVE-2008-3803 was published on 2008-09-26 and last updated on 2026-06-16.

CVE-2008-3803

CVE-2008-3803 is a medium-severity vulnerability in Cisco Ios with a CVSS 2.0 base score of 5.1. 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 5.1)
EPSS exploit prediction: 3% (84th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Cisco Ios
Published: 2008-09-26
Last modified: 2026-06-16

Description

A "logic error" in Cisco IOS 12.0 through 12.4, when a Multiprotocol Label Switching (MPLS) VPN with extended communities is configured, sometimes causes a corrupted route target (RT) to be used, which allows remote attackers to read traffic from other VPNs in opportunistic circumstances.

Frequently asked questions

What is CVE-2008-3803?: A "logic error" in Cisco IOS 12.0 through 12.4, when a Multiprotocol Label Switching (MPLS) VPN with extended communities is configured, sometimes causes a corrupted route target (RT) to be used, which allows remote attackers to read traffic from other VPNs in opportunistic circumstances.
How severe is CVE-2008-3803?: CVE-2008-3803 has a CVSS 2.0 base score of 5.1, rated medium severity.
Is CVE-2008-3803 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (84th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2008-3803?: CVE-2008-3803 primarily affects Cisco Ios. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2008-3803?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2008-3803 published?: CVE-2008-3803 was published on 2008-09-26 and last updated on 2026-06-16.

References

Affected products (3)

cpe:2.3:o:cisco:ios:12.0s:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.0sx:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.0sz:*:*:*:*:*:*:*

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