How severe is CVE-2008-3811?

CVE-2008-3811 has a CVSS 2.0 base score of 7.8, rated high severity.

Is CVE-2008-3811 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (78th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2008-3811?

CVE-2008-3811 primarily affects Cisco Ios. In total, 17 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2008-3811?

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-2008-3811 published?

CVE-2008-3811 was published on 2008-09-26 and last updated on 2026-06-16.

CVE-2008-3811

CVE-2008-3811 is a high-severity vulnerability in Cisco Ios with a CVSS 2.0 base score of 7.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-20.

Key facts

Severity: High (CVSS 2.0 base score 7.8)
EPSS exploit prediction: 2% (78th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-20
Affected product: Cisco Ios
Published: 2008-09-26
Last modified: 2026-06-16

Description

Cisco IOS 12.2 and 12.4, when NAT Skinny Call Control Protocol (SCCP) Fragmentation Support is enabled, allows remote attackers to cause a denial of service (device reload) via segmented SCCP messages, aka Cisco Bug ID CSCsi17020, a different vulnerability than CVE-2008-3810.

Frequently asked questions

What is CVE-2008-3811?: Cisco IOS 12.2 and 12.4, when NAT Skinny Call Control Protocol (SCCP) Fragmentation Support is enabled, allows remote attackers to cause a denial of service (device reload) via segmented SCCP messages, aka Cisco Bug ID CSCsi17020, a different vulnerability than CVE-2008-3810.
How severe is CVE-2008-3811?: CVE-2008-3811 has a CVSS 2.0 base score of 7.8, rated high severity.
Is CVE-2008-3811 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (78th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2008-3811?: CVE-2008-3811 primarily affects Cisco Ios. In total, 17 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2008-3811?: 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-2008-3811 published?: CVE-2008-3811 was published on 2008-09-26 and last updated on 2026-06-16.

References

Affected products (17)

cpe:2.3:o:cisco:ios:12.4md:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.4mr:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.4sw:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.4t:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.4xc:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.4xe:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.4xf:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.4xg:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.4xj:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.4xk:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.4xl:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.4xm:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.4xn:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.4xp:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.4xt:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.4xv:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:12.4xw:*:*:*:*:*:*:*

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