Description

As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco Secure Email Gateway and Cisco Secure Email and Web Manager engineering team has conducted a comprehensive internal security review. This review resulted in software hardening releases that address multiple internally discovered vulnerabilities. The vulnerabilities tracked by CVE-2026-76442 are related to issues with improper validation of specified quantity in input that are grouped under the Common Weakness Enumeration (CWE) Pillar CWE-1284.

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "7.5",
  "pubDate": "2026-09-14T17:17:50.810Z",
  "pubdate": "2026-09-14T17:17:50.810Z",
  "executiveSummary": "CVE-2026-76442 describes a security vulnerability involving improper validation of specified quantity in input, categorized under CWE-1284, affecting Cisco Secure Email Gateway and Cisco Secure Email and Web Manager.\nThis vulnerability stems from the insufficient sanitization and validation of numerical or quantitative input parameters processed by the underlying application logic.\nAn unauthenticated or authenticated attacker with network access to the target system could potentially exploit this weakness to trigger unexpected behavior within the application process.\nThe primary risk implications include potential service instability or compromise of data integrity if the improperly validated input results in buffer-related errors or logic corruption during the processing of specialized quantitative data.\nThe vulnerability was discovered through internal security reviews, leading to software hardening releases. Organizations are urged to evaluate the impact based on their specific deployment environments and apply relevant security updates as part of standard vulnerability management practices.",
  "technicalDetails": "The vulnerability identified as CVE-2026-76442 pertains to a failure in the input validation mechanisms within Cisco Secure Email Gateway and Cisco Secure Email and Web Manager. The core issue is classified under CWE-1284 (Improper Validation of Specified Quantity in Input), which indicates that the application does not adequately verify the magnitude, bounds, or integrity of quantitative data provided via user-controlled input vectors.\nFrom a root cause perspective, the affected software components likely rely on internal functions that ingest quantity-based parameters without enforcing strict schema constraints or range checks. When the input provided does not conform to the expected format or size, the application may enter an inconsistent state. This creates an environment conducive to memory corruption or logic errors if the application logic uses these unvalidated values to allocate memory, initialize arrays, or perform arithmetic operations.\nThe attack flow for this vulnerability involves an adversary crafting specific input containing malicious or out-of-bound quantitative values. By submitting this payload through the product's interface—specifically targeting the modules responsible for handling quantitative data—the attacker can influence the internal control flow. If the software does not properly sanitize these inputs, the subsequent processing stage may lead to a write-out-of-bounds, integer overflow, or resource exhaustion condition depending on how the quantity parameter is interpreted by the backend sub-routine.\nRegarding exploitation, the success of an attack depends on the adversary's ability to reach the vulnerable component. Given the nature of these products, the attack surface likely includes administrative or processing interfaces accessible over the network. If the validation check is absent at the boundary, the payload bypasses initial filtering and reaches the deep-packet or deep-logic inspection layers. Post-exploitation impact could range from causing a denial-of-service (DoS) condition via application crash to potentially more severe consequences if the input allows for arbitrary manipulation of the data-processing loop. The lack of specific exploitation metadata implies that practitioners should focus on the lack of input hardening as the primary vector for potential system instability."
}