https://patchthecve.com/CVEs with upgrade or downgrade fix stepshttps://patchthecve.com/cve/CVE-2021-36762.htmlhttps://patchthecve.com/cve/CVE-2021-36762.htmlWed, 17 Jun 2026 03:59:07 +0000HIGH 7.5: An issue was discovered in HCC Embedded InterNiche NicheStack through 4.3. The tfshnd():tftpsrv.c TFTP packet processing function doesn't ensure that a filename is adequately '\0' terminated; therefore, a subsequent call to strlen for the filename might read out of bounds of the protocol packet buffhttps://patchthecve.com/cve/CVE-2021-31401.htmlhttps://patchthecve.com/cve/CVE-2021-31401.htmlWed, 17 Jun 2026 03:51:42 +0000HIGH 7.5: An issue was discovered in tcp_rcv() in nptcp.c in HCC embedded InterNiche 4.0.1. The TCP header processing code doesn't sanitize the value of the IP total length field (header length + data length). With a crafted IP packet, an integer overflow occurs whenever the value of the IP data length is calhttps://patchthecve.com/cve/CVE-2021-27565.htmlhttps://patchthecve.com/cve/CVE-2021-27565.htmlWed, 17 Jun 2026 03:45:08 +0000HIGH 7.5: The web server in InterNiche NicheStack through 4.0.1 allows remote attackers to cause a denial of service (infinite loop and networking outage) via an unexpected valid HTTP request such as OPTIONS. This occurs because the HTTP request handler enters a miscoded wbs_loop() debugger hook.https://patchthecve.com/cve/CVE-2020-35685.htmlhttps://patchthecve.com/cve/CVE-2020-35685.htmlWed, 17 Jun 2026 03:14:07 +0000CRITICAL 9.1: An issue was discovered in HCC Nichestack 3.0. The code that generates Initial Sequence Numbers (ISNs) for TCP connections derives the ISN from an insufficiently random source. As a result, an attacker may be able to determine the ISN of current and future TCP connections and either hijack existing https://patchthecve.com/cve/CVE-2020-35684.htmlhttps://patchthecve.com/cve/CVE-2020-35684.htmlWed, 17 Jun 2026 03:14:07 +0000HIGH 7.5: An issue was discovered in HCC Nichestack 3.0. The code that parses TCP packets relies on an unchecked value of the IP payload size (extracted from the IP header) to compute the length of the TCP payload within the TCP checksum computation function. When the IP payload size is set to be smaller thanhttps://patchthecve.com/cve/CVE-2020-35683.htmlhttps://patchthecve.com/cve/CVE-2020-35683.htmlWed, 17 Jun 2026 03:14:07 +0000HIGH 7.5: An issue was discovered in HCC Nichestack 3.0. The code that parses ICMP packets relies on an unchecked value of the IP payload size (extracted from the IP header) to compute the ICMP checksum. When the IP payload size is set to be smaller than the size of the IP header, the ICMP checksum computatiohttps://patchthecve.com/cve/CVE-2021-31400.htmlhttps://patchthecve.com/cve/CVE-2021-31400.htmlWed, 17 Jun 2026 03:51:42 +0000HIGH 7.5: An issue was discovered in tcp_pulloutofband() in tcp_in.c in HCC embedded InterNiche 4.0.1. The TCP out-of-band urgent-data processing function invokes a panic function if the pointer to the end of the out-of-band data points outside of the TCP segment's data. If the panic function hadn't a trap inhttps://patchthecve.com/cve/CVE-2021-31228.htmlhttps://patchthecve.com/cve/CVE-2021-31228.htmlWed, 17 Jun 2026 03:51:29 +0000HIGH 7.5: An issue was discovered in HCC embedded InterNiche 4.0.1. This vulnerability allows the attacker to predict a DNS query's source port in order to send forged DNS response packets that will be accepted as valid answers to the DNS client's requests (without sniffing the specific request). Data is predhttps://patchthecve.com/cve/CVE-2021-31227.htmlhttps://patchthecve.com/cve/CVE-2021-31227.htmlWed, 17 Jun 2026 03:51:28 +0000HIGH 7.5: An issue was discovered in HCC embedded InterNiche 4.0.1. A potential heap buffer overflow exists in the code that parses the HTTP POST request, due to an incorrect signed integer comparison. This vulnerability requires the attacker to send a malformed HTTP packet with a negative Content-Length, whihttps://patchthecve.com/cve/CVE-2021-31226.htmlhttps://patchthecve.com/cve/CVE-2021-31226.htmlWed, 17 Jun 2026 03:51:28 +0000CRITICAL 9.8: An issue was discovered in HCC embedded InterNiche 4.0.1. A potential heap buffer overflow exists in the code that parses the HTTP POST request, due to lack of size validation. This vulnerability requires the attacker to send a crafted HTTP POST request with a URI longer than 50 bytes. This leads tohttps://patchthecve.com/cve/CVE-2020-25928.htmlhttps://patchthecve.com/cve/CVE-2020-25928.htmlWed, 17 Jun 2026 03:07:27 +0000CRITICAL 9.8: The DNS feature in InterNiche NicheStack TCP/IP 4.0.1 is affected by: Buffer Overflow. The impact is: execute arbitrary code (remote). The component is: DNS response processing functions: dns_upcall(), getoffset(), dnc_set_answer(). The attack vector is: a specific DNS response packet. The code doeshttps://patchthecve.com/cve/CVE-2020-25927.htmlhttps://patchthecve.com/cve/CVE-2020-25927.htmlWed, 17 Jun 2026 03:07:27 +0000HIGH 7.5: The DNS feature in InterNiche NicheStack TCP/IP 4.0.1 is affected by: Out-of-bounds Read. The impact is: a denial of service (remote). The component is: DNS response processing in function: dns_upcall(). The attack vector is: a specific DNS response packet. The code does not check whether the numberhttps://patchthecve.com/cve/CVE-2020-25926.htmlhttps://patchthecve.com/cve/CVE-2020-25926.htmlWed, 17 Jun 2026 03:07:27 +0000HIGH 7.5: The DNS client in InterNiche NicheStack TCP/IP 4.0.1 is affected by: Insufficient entropy in the DNS transaction id. The impact is: DNS cache poisoning (remote). The component is: dns_query_type(). The attack vector is: a specific DNS response packet.https://patchthecve.com/cve/CVE-2020-25767.htmlhttps://patchthecve.com/cve/CVE-2020-25767.htmlWed, 17 Jun 2026 03:07:16 +0000HIGH 7.5: An issue was discovered in HCC Embedded NicheStack IPv4 4.1. The dnc_copy_in routine for parsing DNS domain names does not check whether a domain name compression pointer is pointing within the bounds of the packet (e.g., forward compression pointer jumps are allowed), which leads to an Out-of-bound