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    CVE-2021-40523

    In Contiki 3.0, Telnet option negotiation is mishandled. During negotiation between a server and a client, the server may fail to give the WILL/WONT or DO/DONT response for DO and WILL commands because of improper handling of exception condition, which leads to property violations and denial of service. Specifically, a server sometimes sends no response, because a fixed buffer space is available for all responses and that space may have been exhausted.

    Published:Sep 5, 2021
    Last Modified:Nov 21, 2024
    EPS:Sep 5, 2021
    EPSS Score:0.00334
    CVSS Score:7.5

    Affected Products

    Vendor
    Contiki-os
    Product
    Contiki

    Exploits

    No exploit reference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Related CVEs

    CVE-2021-38386 (CVSS 7.5) — In Contiki 3.0, a buffer overflow in the Telnet service allows remote attackers to cause a denial of service b…
    CVE-2021-38387 (CVSS 7.5) — In Contiki 3.0, a Telnet server that silently quits (before disconnection with clients) leads to connected cli…
    CVE-2021-38311 (CVSS 7.5) — In Contiki 3.0, potential nonterminating acknowledgment loops exist in the Telnet service. When the negotiated…
    CVE-2021-28362 (CVSS 7.5) — An issue was discovered in Contiki through 3.0. When sending an ICMPv6 error message because of invalid extens…
    CVE-2020-24335 (CVSS 7.5) — An issue was discovered in uIP through 1.0, as used in Contiki and Contiki-NG. Domain name parsing lacks bound…
    CVE-2020-24336 (CVSS 9.8) — An issue was discovered in Contiki through 3.0 and Contiki-NG through 4.5. The code for parsing Type A domain …
    CVE-2020-24334 (CVSS 8.2) — The code that processes DNS responses in uIP through 1.0, as used in Contiki and Contiki-NG, does not check wh…
    CVE-2020-17440 (CVSS 7.5) — An issue was discovered in uIP 1.0, as used in Contiki 3.0 and other products. The code that parses incoming D…
    CVE-2020-17439 (CVSS 8.3) — An issue was discovered in uIP 1.0, as used in Contiki 3.0 and other products. The code that parses incoming D…
    CVE-2020-17438 (CVSS 9.8) — An issue was discovered in uIP 1.0, as used in Contiki 3.0 and other products. The code that reassembles fragm…

    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