CVE-2022-28887 in Product
Summary
by MITRE • 10/12/2022
Multiple Denial-of-Service (DoS) vulnerability was discovered in F-Secure & WithSecure products whereby the aerdl.dll unpacker handler function crashes. This can lead to a possible scanning engine crash.
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Analysis
by VulDB Data Team • 05/22/2026
The vulnerability identified as CVE-2022-28887 represents a critical denial-of-service weakness affecting F-Secure and WithSecure security products. This issue specifically targets the aerdl.dll unpacker handler function which serves as a crucial component in the scanning engine's processing pipeline. The flaw manifests when the system encounters certain malformed or crafted input data that triggers an unexpected crash within the unpacker handler, ultimately leading to a complete scanning engine failure. This vulnerability directly impacts the availability and reliability of endpoint protection services, potentially leaving systems exposed to threats during the period when the scanning engine is non-operational.
The technical root cause of this vulnerability lies in insufficient input validation and error handling within the aerdl.dll module. When the unpacker handler function processes specific data patterns, it fails to properly validate the input structure before attempting to parse or execute operations on the data. This lack of proper boundary checking and input sanitization creates a condition where malformed data can cause the function to access invalid memory locations or execute unintended code paths, resulting in a segmentation fault or similar critical error that terminates the scanning engine process. The vulnerability falls under the category of improper input validation as classified by CWE-20, specifically involving weaknesses in the handling of data structures that should be properly validated before processing.
From an operational perspective, this vulnerability poses significant risk to organizations relying on F-Secure and WithSecure products for endpoint protection. The DoS condition can be triggered remotely through various attack vectors including email attachments, downloaded files, or network traffic that passes through the affected security appliances. The impact extends beyond simple service disruption as it can compromise the entire security infrastructure, potentially allowing malicious actors to exploit the vulnerability to maintain persistence or escalate their attacks. Security operations teams may experience false positives during routine scanning operations, and the automatic restart of the scanning engine might not occur immediately, creating windows of exposure. This vulnerability aligns with ATT&CK technique T1499.004 which covers network denial of service attacks, and represents a critical weakness in the security product's resilience against adversarial input manipulation.
Organizations should implement immediate mitigations including applying the vendor-provided patches and updates as soon as they become available. Network segmentation and monitoring should be enhanced to detect anomalous behavior that might indicate exploitation attempts. Security teams should consider temporarily disabling the affected unpacker functionality if immediate patching is not feasible, though this may reduce overall scanning effectiveness. Regular vulnerability assessments should be conducted to identify similar weaknesses in other security components, particularly those handling unpacking and decompression operations. The vulnerability highlights the importance of robust error handling in security software and demonstrates the need for comprehensive input validation across all processing modules. Additionally, implementing automated monitoring solutions that can detect and alert on scanning engine crashes or restarts will help maintain visibility into the security infrastructure's operational status and enable rapid response to potential exploitation attempts.