How severe is CVE-2009-1165?

CVE-2009-1165 has a CVSS 2.0 base score of 7.8, rated high severity.

Is CVE-2009-1165 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (73rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2009-1165?

CVE-2009-1165 primarily affects Cisco Catalyst 3750g. In total, 37 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2009-1165?

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-2009-1165 published?

CVE-2009-1165 was published on 2009-07-29 and last updated on 2026-06-16.

CVE-2009-1165

CVE-2009-1165 is a high-severity vulnerability in Cisco Catalyst 3750g 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-399.

Key facts

Severity: High (CVSS 2.0 base score 7.8)
EPSS exploit prediction: 2% (73rd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-399
Affected product: Cisco Catalyst 3750g
Published: 2009-07-29
Last modified: 2026-06-16

Description

Memory leak on the Cisco Wireless LAN Controller (WLC) platform 4.x before 4.2.205.0, 5.1 before 5.1.163.0, and 5.0 and 5.2 before 5.2.178.0, as used in Cisco 1500 Series, 2000 Series, 2100 Series, 4100 Series, 4200 Series, and 4400 Series Wireless Services Modules (WiSM), WLC Modules for Integrated Services Routers, and Catalyst 3750G Integrated Wireless LAN Controllers, allows remote attackers to cause a denial of service (memory consumption and device reload) via SSH management connections, aka Bug ID CSCsw40789.

Frequently asked questions

What is CVE-2009-1165?: Memory leak on the Cisco Wireless LAN Controller (WLC) platform 4.x before 4.2.205.0, 5.1 before 5.1.163.0, and 5.0 and 5.2 before 5.2.178.0, as used in Cisco 1500 Series, 2000 Series, 2100 Series, 4100 Series, 4200 Series, and 4400 Series Wireless Services Modules (WiSM), WLC Modules for Integrated Services Routers, and Catalyst 3750G Integrated Wireless LAN Controllers, allows remote attackers to cause a denial of service (memory consumption and device reload) via SSH management connections, aka Bug ID CSCsw40789.
How severe is CVE-2009-1165?: CVE-2009-1165 has a CVSS 2.0 base score of 7.8, rated high severity.
Is CVE-2009-1165 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (73rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2009-1165?: CVE-2009-1165 primarily affects Cisco Catalyst 3750g. In total, 37 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2009-1165?: 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-2009-1165 published?: CVE-2009-1165 was published on 2009-07-29 and last updated on 2026-06-16.

References

Affected products (37)

cpe:2.3:h:cisco:catalyst_3750g:*:*:*:*:*:*:*:*
cpe:2.3:h:cisco:cisco_1500_wireless_lan_controller:4.1:*:*:*:*:*:*:*
cpe:2.3:h:cisco:cisco_1500_wireless_lan_controller:4.1m:*:*:*:*:*:*:*
cpe:2.3:h:cisco:cisco_1500_wireless_lan_controller:4.2:*:*:*:*:*:*:*
cpe:2.3:h:cisco:cisco_1500_wireless_lan_controller:5.0:*:*:*:*:*:*:*
cpe:2.3:h:cisco:cisco_1500_wireless_lan_controller:5.1:*:*:*:*:*:*:*
cpe:2.3:h:cisco:cisco_1500_wireless_lan_controller:5.2:*:*:*:*:*:*:*
cpe:2.3:h:cisco:cisco_2000_wireless_lan_controller:4.1:*:*:*:*:*:*:*
cpe:2.3:h:cisco:cisco_2000_wireless_lan_controller:4.1m:*:*:*:*:*:*:*
cpe:2.3:h:cisco:cisco_2000_wireless_lan_controller:4.2:*:*:*:*:*:*:*
cpe:2.3:h:cisco:cisco_2000_wireless_lan_controller:5.0:*:*:*:*:*:*:*
cpe:2.3:h:cisco:cisco_2000_wireless_lan_controller:5.1:*:*:*:*:*:*:*
cpe:2.3:h:cisco:cisco_2000_wireless_lan_controller:5.2:*:*:*:*:*:*:*
cpe:2.3:h:cisco:cisco_2100_wireless_lan_controller:4.1:*:*:*:*:*:*:*
cpe:2.3:h:cisco:cisco_2100_wireless_lan_controller:4.1m:*:*:*:*:*:*:*
cpe:2.3:h:cisco:cisco_2100_wireless_lan_controller:4.2:*:*:*:*:*:*:*
cpe:2.3:h:cisco:cisco_2100_wireless_lan_controller:5.0:*:*:*:*:*:*:*
cpe:2.3:h:cisco:cisco_2100_wireless_lan_controller:5.1:*:*:*:*:*:*:*
cpe:2.3:h:cisco:cisco_2100_wireless_lan_controller:5.2:*:*:*:*:*:*:*
cpe:2.3:h:cisco:cisco_4100_wireless_lan_controller:4.1:*:*:*:*:*:*:*
cpe:2.3:h:cisco:cisco_4100_wireless_lan_controller:4.1m:*:*:*:*:*:*:*
cpe:2.3:h:cisco:cisco_4100_wireless_lan_controller:4.2:*:*:*:*:*:*:*
cpe:2.3:h:cisco:cisco_4100_wireless_lan_controller:5.0:*:*:*:*:*:*:*
cpe:2.3:h:cisco:cisco_4100_wireless_lan_controller:5.1:*:*:*:*:*:*:*
cpe:2.3:h:cisco:cisco_4100_wireless_lan_controller:5.2:*:*:*:*:*:*:*
cpe:2.3:h:cisco:cisco_4200_wireless_lan_controller:4.1:*:*:*:*:*:*:*
cpe:2.3:h:cisco:cisco_4200_wireless_lan_controller:4.1m:*:*:*:*:*:*:*
cpe:2.3:h:cisco:cisco_4200_wireless_lan_controller:4.2:*:*:*:*:*:*:*
cpe:2.3:h:cisco:cisco_4200_wireless_lan_controller:5.0:*:*:*:*:*:*:*
cpe:2.3:h:cisco:cisco_4200_wireless_lan_controller:5.1:*:*:*:*:*:*:*
cpe:2.3:h:cisco:cisco_4200_wireless_lan_controller:5.2:*:*:*:*:*:*:*
cpe:2.3:h:cisco:cisco_4400_wireless_lan_controller:4.1:*:*:*:*:*:*:*
cpe:2.3:h:cisco:cisco_4400_wireless_lan_controller:4.1m:*:*:*:*:*:*:*
cpe:2.3:h:cisco:cisco_4400_wireless_lan_controller:4.2:*:*:*:*:*:*:*
cpe:2.3:h:cisco:cisco_4400_wireless_lan_controller:5.0:*:*:*:*:*:*:*
cpe:2.3:h:cisco:cisco_4400_wireless_lan_controller:5.1:*:*:*:*:*:*:*
cpe:2.3:h:cisco:cisco_4400_wireless_lan_controller:5.2:*:*:*:*:*:*:*

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