How severe is CVE-2009-2818?

CVE-2009-2818 has a CVSS 2.0 base score of 5.0, rated medium severity.

Is CVE-2009-2818 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (77th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2009-2818?

CVE-2009-2818 primarily affects Apple Mac Os X Server. In total, 59 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2009-2818?

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

When was CVE-2009-2818 published?

CVE-2009-2818 was published on 2009-11-10 and last updated on 2026-06-16.

CVE-2009-2818

CVE-2009-2818 is a medium-severity vulnerability in Apple Mac Os X Server with a CVSS 2.0 base score of 5.0. 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-264.

Key facts

Severity: Medium (CVSS 2.0 base score 5.0)
EPSS exploit prediction: 2% (77th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-264
Affected product: Apple Mac Os X Server
Published: 2009-11-10
Last modified: 2026-06-16

Description

Adaptive Firewall in Apple Mac OS X before 10.6.2 does not properly handle invalid usernames in SSH login attempts, which makes it easier for remote attackers to obtain login access via a brute-force attack (aka dictionary attack).

Frequently asked questions

What is CVE-2009-2818?: Adaptive Firewall in Apple Mac OS X before 10.6.2 does not properly handle invalid usernames in SSH login attempts, which makes it easier for remote attackers to obtain login access via a brute-force attack (aka dictionary attack).
How severe is CVE-2009-2818?: CVE-2009-2818 has a CVSS 2.0 base score of 5.0, rated medium severity.
Is CVE-2009-2818 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (77th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2009-2818?: CVE-2009-2818 primarily affects Apple Mac Os X Server. In total, 59 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2009-2818?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2009-2818 published?: CVE-2009-2818 was published on 2009-11-10 and last updated on 2026-06-16.

References

Affected products (59)

cpe:2.3:o:apple:mac_os_x_server:*:*:*:*:*:*:*:*
cpe:2.3:o:apple:mac_os_x_server:10.0:*:*:*:*:*:*:*
cpe:2.3:o:apple:mac_os_x_server:10.0.0:*:*:*:*:*:*:*
cpe:2.3:o:apple:mac_os_x_server:10.0.1:*:*:*:*:*:*:*
cpe:2.3:o:apple:mac_os_x_server:10.0.2:*:*:*:*:*:*:*
cpe:2.3:o:apple:mac_os_x_server:10.0.3:*:*:*:*:*:*:*
cpe:2.3:o:apple:mac_os_x_server:10.0.4:*:*:*:*:*:*:*
cpe:2.3:o:apple:mac_os_x_server:10.1:*:*:*:*:*:*:*
cpe:2.3:o:apple:mac_os_x_server:10.1.0:*:*:*:*:*:*:*
cpe:2.3:o:apple:mac_os_x_server:10.1.1:*:*:*:*:*:*:*
cpe:2.3:o:apple:mac_os_x_server:10.1.2:*:*:*:*:*:*:*
cpe:2.3:o:apple:mac_os_x_server:10.1.3:*:*:*:*:*:*:*
cpe:2.3:o:apple:mac_os_x_server:10.1.4:*:*:*:*:*:*:*
cpe:2.3:o:apple:mac_os_x_server:10.1.5:*:*:*:*:*:*:*
cpe:2.3:o:apple:mac_os_x_server:10.2:*:*:*:*:*:*:*
cpe:2.3:o:apple:mac_os_x_server:10.2.0:*:*:*:*:*:*:*
cpe:2.3:o:apple:mac_os_x_server:10.2.1:*:*:*:*:*:*:*
cpe:2.3:o:apple:mac_os_x_server:10.2.2:*:*:*:*:*:*:*
cpe:2.3:o:apple:mac_os_x_server:10.2.3:*:*:*:*:*:*:*
cpe:2.3:o:apple:mac_os_x_server:10.2.4:*:*:*:*:*:*:*
cpe:2.3:o:apple:mac_os_x_server:10.2.5:*:*:*:*:*:*:*
cpe:2.3:o:apple:mac_os_x_server:10.2.6:*:*:*:*:*:*:*
cpe:2.3:o:apple:mac_os_x_server:10.2.7:*:*:*:*:*:*:*
cpe:2.3:o:apple:mac_os_x_server:10.2.8:*:*:*:*:*:*:*
cpe:2.3:o:apple:mac_os_x_server:10.3:*:*:*:*:*:*:*
cpe:2.3:o:apple:mac_os_x_server:10.3.0:*:*:*:*:*:*:*
cpe:2.3:o:apple:mac_os_x_server:10.3.1:*:*:*:*:*:*:*
cpe:2.3:o:apple:mac_os_x_server:10.3.2:*:*:*:*:*:*:*
cpe:2.3:o:apple:mac_os_x_server:10.3.3:*:*:*:*:*:*:*
cpe:2.3:o:apple:mac_os_x_server:10.3.4:*:*:*:*:*:*:*
cpe:2.3:o:apple:mac_os_x_server:10.3.5:*:*:*:*:*:*:*
cpe:2.3:o:apple:mac_os_x_server:10.3.6:*:*:*:*:*:*:*
cpe:2.3:o:apple:mac_os_x_server:10.3.7:*:*:*:*:*:*:*
cpe:2.3:o:apple:mac_os_x_server:10.3.8:*:*:*:*:*:*:*
cpe:2.3:o:apple:mac_os_x_server:10.3.9:*:*:*:*:*:*:*
cpe:2.3:o:apple:mac_os_x_server:10.4:*:*:*:*:*:*:*
cpe:2.3:o:apple:mac_os_x_server:10.4.0:*:*:*:*:*:*:*
cpe:2.3:o:apple:mac_os_x_server:10.4.1:*:*:*:*:*:*:*
cpe:2.3:o:apple:mac_os_x_server:10.4.2:*:*:*:*:*:*:*
cpe:2.3:o:apple:mac_os_x_server:10.4.3:*:*:*:*:*:*:*

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