https://patchthecve.com/CVEs with upgrade or downgrade fix stepshttps://patchthecve.com/cve/CVE-2021-40523.htmlhttps://patchthecve.com/cve/CVE-2021-40523.htmlWed, 17 Jun 2026 04:07:05 +0000HIGH 7.5: 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 servhttps://patchthecve.com/cve/CVE-2021-38387.htmlhttps://patchthecve.com/cve/CVE-2021-38387.htmlWed, 17 Jun 2026 04:02:00 +0000HIGH 7.5: In Contiki 3.0, a Telnet server that silently quits (before disconnection with clients) leads to connected clients entering an infinite loop and waiting forever, which may cause excessive CPU consumption.https://patchthecve.com/cve/CVE-2021-38386.htmlhttps://patchthecve.com/cve/CVE-2021-38386.htmlWed, 17 Jun 2026 04:01:59 +0000HIGH 7.5: In Contiki 3.0, a buffer overflow in the Telnet service allows remote attackers to cause a denial of service because the ls command is mishandled when a directory has many files with long names.https://patchthecve.com/cve/CVE-2021-28362.htmlhttps://patchthecve.com/cve/CVE-2021-28362.htmlWed, 17 Jun 2026 03:46:17 +0000HIGH 7.5: An issue was discovered in Contiki through 3.0. When sending an ICMPv6 error message because of invalid extension header options in an incoming IPv6 packet, there is an attempt to remove the RPL extension headers. Because the packet length and the extension header length are unchecked (with respect https://patchthecve.com/cve/CVE-2020-24336.htmlhttps://patchthecve.com/cve/CVE-2020-24336.htmlWed, 17 Jun 2026 03:05:23 +0000CRITICAL 9.8: An issue was discovered in Contiki through 3.0 and Contiki-NG through 4.5. The code for parsing Type A domain name answers in ip64-dns64.c doesn't verify whether the address in the answer's length is sane. Therefore, when copying an address of an arbitrary length, a buffer overflow can occur. This bhttps://patchthecve.com/cve/CVE-2020-13986.htmlhttps://patchthecve.com/cve/CVE-2020-13986.htmlWed, 17 Jun 2026 02:54:03 +0000HIGH 7.5: An issue was discovered in Contiki through 3.0. An infinite loop exists in the uIP TCP/IP stack component when handling RPL extension headers of IPv6 network packets in rpl_remove_header in net/rpl/rpl-ext-header.c.https://patchthecve.com/cve/CVE-2020-13985.htmlhttps://patchthecve.com/cve/CVE-2020-13985.htmlWed, 17 Jun 2026 02:54:03 +0000HIGH 7.5: An issue was discovered in Contiki through 3.0. A memory corruption vulnerability exists in the uIP TCP/IP stack component when handling RPL extension headers of IPv6 network packets in rpl_remove_header in net/rpl/rpl-ext-header.c.https://patchthecve.com/cve/CVE-2020-13984.htmlhttps://patchthecve.com/cve/CVE-2020-13984.htmlWed, 17 Jun 2026 02:54:03 +0000HIGH 7.5: An issue was discovered in Contiki through 3.0. An infinite loop exists in the uIP TCP/IP stack component when processing IPv6 extension headers in ext_hdr_options_process in net/ipv6/uip6.c.https://patchthecve.com/cve/CVE-2019-9183.htmlhttps://patchthecve.com/cve/CVE-2019-9183.htmlWed, 17 Jun 2026 02:43:18 +0000HIGH 7.5: An issue was discovered in Contiki-NG through 4.3 and Contiki through 3.0. A buffer overflow is present due to an integer underflow during 6LoWPAN fragment processing in the face of truncated fragments in os/net/ipv6/sicslowpan.c. This results in accesses of unmapped memory, crashing the applicationhttps://patchthecve.com/cve/CVE-2019-8359.htmlhttps://patchthecve.com/cve/CVE-2019-8359.htmlWed, 17 Jun 2026 02:41:53 +0000CRITICAL 9.8: An issue was discovered in Contiki-NG through 4.3 and Contiki through 3.0. An out of bounds write is present in the data section during 6LoWPAN fragment re-assembly in the face of forged fragment offsets in os/net/ipv6/sicslowpan.c.