How severe is CVE-2009-0628?

CVE-2009-0628 has a CVSS 2.0 base score of 9.0, rated critical severity.

Is CVE-2009-0628 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-2009-0628?

CVE-2009-0628 primarily affects Cisco Cisco Ios. In total, 67 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2009-0628?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2009-0628 published?

CVE-2009-0628 was published on 2009-03-27 and last updated on 2026-06-16.

CVE-2009-0628

CVE-2009-0628 is a critical-severity vulnerability in Cisco Cisco Ios with a CVSS 2.0 base score of 9.0. 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-200.

Key facts

Severity: Critical (CVSS 2.0 base score 9.0)
EPSS exploit prediction: 2% (78th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-200
Affected product: Cisco Cisco Ios
Published: 2009-03-27
Last modified: 2026-06-16

Description

Memory leak in the SSLVPN feature in Cisco IOS 12.3 through 12.4 allows remote attackers to cause a denial of service (memory consumption and device crash) by disconnecting an SSL session in an abnormal manner, leading to a Transmission Control Block (TCB) leak.

Frequently asked questions

What is CVE-2009-0628?: Memory leak in the SSLVPN feature in Cisco IOS 12.3 through 12.4 allows remote attackers to cause a denial of service (memory consumption and device crash) by disconnecting an SSL session in an abnormal manner, leading to a Transmission Control Block (TCB) leak.
How severe is CVE-2009-0628?: CVE-2009-0628 has a CVSS 2.0 base score of 9.0, rated critical severity.
Is CVE-2009-0628 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-2009-0628?: CVE-2009-0628 primarily affects Cisco Cisco Ios. In total, 67 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2009-0628?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2009-0628 published?: CVE-2009-0628 was published on 2009-03-27 and last updated on 2026-06-16.

References

Affected products (67)

cpe:2.3:o:cisco:cisco_ios:12.3:*:*:*:*:*:*:*
cpe:2.3:o:cisco:cisco_ios:12.3:b:*:*:*:*:*:*
cpe:2.3:o:cisco:cisco_ios:12.3:bc:*:*:*:*:*:*
cpe:2.3:o:cisco:cisco_ios:12.3:bw:*:*:*:*:*:*
cpe:2.3:o:cisco:cisco_ios:12.3:eu:*:*:*:*:*:*
cpe:2.3:o:cisco:cisco_ios:12.3:ja:*:*:*:*:*:*
cpe:2.3:o:cisco:cisco_ios:12.3:jea:*:*:*:*:*:*
cpe:2.3:o:cisco:cisco_ios:12.3:jeb:*:*:*:*:*:*
cpe:2.3:o:cisco:cisco_ios:12.3:jec:*:*:*:*:*:*
cpe:2.3:o:cisco:cisco_ios:12.3:jk:*:*:*:*:*:*
cpe:2.3:o:cisco:cisco_ios:12.3:jl:*:*:*:*:*:*
cpe:2.3:o:cisco:cisco_ios:12.3:jx:*:*:*:*:*:*
cpe:2.3:o:cisco:cisco_ios:12.3:t:*:*:*:*:*:*
cpe:2.3:o:cisco:cisco_ios:12.3:tpc:*:*:*:*:*:*
cpe:2.3:o:cisco:cisco_ios:12.3:va:*:*:*:*:*:*
cpe:2.3:o:cisco:cisco_ios:12.3:xa:*:*:*:*:*:*
cpe:2.3:o:cisco:cisco_ios:12.3:xb:*:*:*:*:*:*
cpe:2.3:o:cisco:cisco_ios:12.3:xc:*:*:*:*:*:*
cpe:2.3:o:cisco:cisco_ios:12.3:xd:*:*:*:*:*:*
cpe:2.3:o:cisco:cisco_ios:12.3:xe:*:*:*:*:*:*
cpe:2.3:o:cisco:cisco_ios:12.3:xf:*:*:*:*:*:*
cpe:2.3:o:cisco:cisco_ios:12.3:xg:*:*:*:*:*:*
cpe:2.3:o:cisco:cisco_ios:12.3:xh:*:*:*:*:*:*
cpe:2.3:o:cisco:cisco_ios:12.3:xi:*:*:*:*:*:*
cpe:2.3:o:cisco:cisco_ios:12.3:xj:*:*:*:*:*:*
cpe:2.3:o:cisco:cisco_ios:12.3:xk:*:*:*:*:*:*
cpe:2.3:o:cisco:cisco_ios:12.3:xq:*:*:*:*:*:*
cpe:2.3:o:cisco:cisco_ios:12.3:xr:*:*:*:*:*:*
cpe:2.3:o:cisco:cisco_ios:12.3:xs:*:*:*:*:*:*
cpe:2.3:o:cisco:cisco_ios:12.3:xu:*:*:*:*:*:*
cpe:2.3:o:cisco:cisco_ios:12.3:xw:*:*:*:*:*:*
cpe:2.3:o:cisco:cisco_ios:12.3:xy:*:*:*:*:*:*
cpe:2.3:o:cisco:cisco_ios:12.3:ya:*:*:*:*:*:*
cpe:2.3:o:cisco:cisco_ios:12.3:yd:*:*:*:*:*:*
cpe:2.3:o:cisco:cisco_ios:12.3:yf:*:*:*:*:*:*
cpe:2.3:o:cisco:cisco_ios:12.3:yg:*:*:*:*:*:*
cpe:2.3:o:cisco:cisco_ios:12.3:yh:*:*:*:*:*:*
cpe:2.3:o:cisco:cisco_ios:12.3:yi:*:*:*:*:*:*
cpe:2.3:o:cisco:cisco_ios:12.3:yj:*:*:*:*:*:*
cpe:2.3:o:cisco:cisco_ios:12.3:yk:*:*:*:*:*:*

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