CVE-2009-4171
CVE-2009-4171 is a medium-severity vulnerability in Yahoo Messenger with a CVSS 2.0 base score of 4.3. 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-119.
Key facts
- Severity: Medium (CVSS 2.0 base score 4.3)
- EPSS exploit prediction: 5% (92nd percentile)
- Actively exploited: Not listed in CISA KEV
- Weakness: CWE-119
- Affected product: Yahoo Messenger
- Published:
- Last modified:
Description
An ActiveX control in YahooBridgeLib.dll for Yahoo! Messenger 9.0.0.2162, and possibly other 9.0 versions, allows remote attackers to cause a denial of service (NULL pointer dereference and application crash) by calling the RegisterMe method with a long argument.
Frequently asked questions
- What is CVE-2009-4171?
- An ActiveX control in YahooBridgeLib.dll for Yahoo! Messenger 9.0.0.2162, and possibly other 9.0 versions, allows remote attackers to cause a denial of service (NULL pointer dereference and application crash) by calling the RegisterMe method with a long argument.
- How severe is CVE-2009-4171?
- CVE-2009-4171 has a CVSS 2.0 base score of 4.3, rated medium severity.
- Is CVE-2009-4171 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 5% (92nd percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2009-4171?
- CVE-2009-4171 affects Yahoo Messenger. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2009-4171?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
- When was CVE-2009-4171 published?
- CVE-2009-4171 was published on 2009-12-02 and last updated on 2026-06-16.
References
- http://www.securityfocus.com/archive/1/507818/100/0/threaded
- http://www.securityfocus.com/bid/37007
- https://exchange.xforce.ibmcloud.com/vulnerabilities/54263
Affected products (1)
- cpe:2.3:a:yahoo:messenger:9.0.0.2162:*:*:*:*:*:*:*
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