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CVE-2009-2191

23
FAUCET Score

CVE-2009-2191 is a format string vulnerability in the Login Window of Apple Mac OS X versions 10.4.11 and 10.5 prior to 10.5.8. This flaw allows an unauthenticated attacker to execute arbitrary code or cause a denial of service by injecting format string specifiers into an application name. With a CVSS score of 7.5, it presents a high severity risk due to its network-based attack vector and potential for complete compromise of confidentiality, integrity, and availability. Despite its severity, there is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
10.5.6CPE matchmatch criteria
cpe:2.3:a:apple:mac_os_x:10.5.6:*:*:*:*:*:*:*
10.4.11CPE matchmatch criteria
cpe:2.3:o:apple:mac_os_x:10.4.11:*:*:*:*:*:*:*
10.5CPE matchmatch criteria
cpe:2.3:o:apple:mac_os_x:10.5:*:*:*:*:*:*:*
10.5.7CPE matchmatch criteria
cpe:2.3:o:apple:mac_os_x:10.5.7:*:*:*:*:*:*:*
10.4.11CPE matchmatch criteria
cpe:2.3:o:apple:mac_os_x_server:10.4.11:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

7.5HIGH

AV:N/AC:L/Au:N/C:P/I:P/A:P

Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
Access Vector
NETWORK
Access Complexity
LOW
Authentication
NONE
Exploitability Score
10.0
Impact Score
6.4
CvssVersion
2.0

Exploit Intelligence

EPSS Score
4.17%
Probability of exploitation in next 30 days
EPSS Percentile
89.8%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0417 is in the 82nd percentile among its peer group of 51,551 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (1)

applepatch availablevia nvd_reference
View patch

References

lists.apple.com / archives/security-announce/2009/Aug/msg00001.html
PatchVendor Advisory
osvdb.org / 56840
secunia.com / advisories/36096
Vendor Advisory
exchange.xforce.ibmcloud.com / vulnerabilities/52428
support.apple.com / kb/HT3757
PatchVendor Advisory
securityfocus.com / bid/35954
Patch
us-cert.gov / cas/techalerts/TA09-218A.html
US Government Resource
vupen.com / english/advisories/2009/2172
PatchVendor Advisory