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    CVE-2026-20311

    A vulnerability in the web-based management interface of Cisco IOS XE Software could allow an authenticated, remote attacker with low privileges to cause a denial of service (DoS) condition on an affected device. This vulnerability is due to insufficient error handling in the web-based management interface. An attacker could exploit this vulnerability by authenticating with a malformed certificate. A successful exploit could allow the attacker to cause the affected device to reload, resulting in a DoS condition.

    Published:Aug 5, 2026
    Last Modified:Aug 7, 2026
    EPS:Aug 5, 2026
    EPSS Score:0.00158
    CVSS Score:6.3

    Affected Products

    Vendor
    Cisco
    Product
    Ios Xe Software

    Exploits

    No exploit reference

    Common Weakness Enumeration

    CWE-126 Buffer Over-read

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

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    CVE-2026-20270 (CVSS 8.6) — As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco IOS XE Software eng…
    CVE-2026-20269 (CVSS 8.6) — As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco IOS XE Software eng…
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    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High