CVE-2022-22658 in iOS
Summary
by MITRE • 11/02/2022
An input validation issue was addressed with improved input validation. This issue is fixed in iOS 16.0.3. Processing a maliciously crafted email message may lead to a denial-of-service.
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Analysis
by VulDB Data Team • 04/28/2026
The vulnerability identified as CVE-2022-22658 represents a critical input validation flaw within Apple's iOS email processing framework that could potentially enable attackers to disrupt email services through carefully crafted malicious messages. This issue falls under the broader category of input validation weaknesses that have been systematically addressed through improved sanitization mechanisms. The vulnerability specifically affects iOS versions prior to 16.0.3, indicating that Apple's security team recognized the severity of the flaw in their email handling components. The issue demonstrates how seemingly benign email processing functionality can become a vector for denial-of-service attacks when proper input validation measures are absent or insufficient. The vulnerability is classified under CWE-20, which encompasses improper input validation, a fundamental weakness that has consistently plagued software systems across various domains including email clients, web applications, and mobile platforms.
The technical exploitation of CVE-2022-22658 occurs when an iOS device processes an email message containing malformed or maliciously constructed data that bypasses existing validation checks. This flaw allows attackers to craft email payloads that, when processed by the iOS email client, trigger unexpected behavior leading to service disruption. The vulnerability manifests as a denial-of-service condition where the email application becomes unresponsive or crashes, effectively preventing users from accessing their email functionality. The attack vector specifically targets the email parsing and rendering components within iOS, where insufficient validation of incoming message data enables the malicious payload to cause system instability. This type of vulnerability aligns with ATT&CK technique T1499.004, which covers network denial of service attacks through manipulation of email protocols and client applications, demonstrating how email systems can serve as attack vectors for service disruption.
The operational impact of CVE-2022-22658 extends beyond simple service interruption to potentially affect business continuity and user productivity across organizations relying on iOS email services. When exploited, the vulnerability can cause cascading effects where multiple users experience email access disruptions simultaneously, particularly in enterprise environments where iOS devices are widely deployed. The vulnerability's impact is particularly concerning given that email remains a primary communication channel for business operations and personal correspondence. Organizations may experience increased support requests, reduced operational efficiency, and potential security implications if attackers leverage this vulnerability as part of broader attack campaigns. The issue highlights the importance of timely patch management and the potential risks associated with delayed security updates in mobile operating systems. Security professionals should consider this vulnerability as part of their broader threat landscape assessment, particularly when evaluating email security controls and mobile device management policies.
The remediation for CVE-2022-22658 requires users to update their iOS devices to version 16.0.3 or later, where Apple has implemented enhanced input validation measures to prevent the processing of maliciously crafted email content. This update addresses the root cause by strengthening the validation logic within the email processing pipeline, ensuring that malformed inputs are properly rejected before they can trigger system instability. Organizations should prioritize the deployment of this security update across all iOS devices within their managed environments, particularly those handling sensitive communications or serving critical business functions. The fix demonstrates Apple's approach to addressing input validation vulnerabilities through proactive security measures that improve system robustness against crafted malicious inputs. Security teams should monitor for any additional related vulnerabilities that may emerge from similar input validation weaknesses and ensure that email security policies account for mobile device vulnerabilities in their overall threat mitigation strategies.