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    CVE-2021-1403

    A vulnerability in the web UI feature of Cisco IOS XE Software could allow an unauthenticated, remote attacker to conduct a cross-site WebSocket hijacking (CSWSH) attack and cause a denial of service (DoS) condition on an affected device. This vulnerability is due to insufficient HTTP protections in the web UI on an affected device. An attacker could exploit this vulnerability by persuading an authenticated user of the web UI to follow a crafted link. A successful exploit could allow the attacker to corrupt memory on the affected device, forcing it to reload and causing a DoS condition.

    Published:Mar 24, 2021
    Last Modified:Nov 21, 2024
    EPS:Mar 24, 2021
    EPSS Score:0.00122
    CVSS Score:7.4

    Affected Products

    Vendor
    Cisco
    Product
    Ios Xe

    Exploits

    No exploit reference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-103 Clickjacking
    CAPEC-111 JSON Hijacking (aka JavaScript Hijacking)
    CAPEC-141 Cache Poisoning
    CAPEC-142 DNS Cache Poisoning
    CAPEC-148 Content Spoofing
    CAPEC-181 Flash File Overlay
    CAPEC-218 Spoofing of UDDI/ebXML Messages
    CAPEC-222 iFrame Overlay
    CAPEC-384 Application API Message Manipulation via Man-in-the-Middle
    CAPEC-385 Transaction or Event Tampering via Application API Manipulation
    CAPEC-386 Application API Navigation Remapping
    CAPEC-387 Navigation Remapping To Propagate Malicious Content
    CAPEC-388 Application API Button Hijacking
    CAPEC-504 Task Impersonation
    CAPEC-506 Tapjacking
    CAPEC-587 Cross Frame Scripting (XFS)
    CAPEC-654 Credential Prompt Impersonation
    CAPEC-665 Exploitation of Thunderbolt Protection Flaws
    CAPEC-701 Browser in the Middle (BiTM)

    Related CVEs

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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…
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    CVE-2026-20268 (CVSS 8.6) — As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco IOS XE Software eng…
    CVE-2026-20267 (CVSS 9) — 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