{"id":86061,"date":"2025-12-17T10:27:31","date_gmt":"2025-12-17T10:27:31","guid":{"rendered":""},"modified":"-0001-11-30T00:00:00","modified_gmt":"-0001-11-30T00:00:00","slug":"cve-2023-43511-dos-vulnerability-in-ipv6-extension-header-parsing","status":"publish","type":"post","link":"https:\/\/www.ameeba.com\/blog\/cve-2023-43511-dos-vulnerability-in-ipv6-extension-header-parsing\/","title":{"rendered":"CVE-2023-43511: DOS Vulnerability in IPv6 Extension Header Parsing<\/strong>"},"content":{"rendered":"

Overview<\/strong><\/p>\n

The vulnerability identified as CVE-2023-43511 is a significant threat to the cybersecurity landscape. It is a Denial of Service (DOS) vulnerability that occurs during the parsing of an IPv6 extension header in the WLAN firmware. Should a system receive an IPv6 packet that contains `IPPROTO_NONE` as the next header, a transient DOS can occur. This vulnerability can lead to potential system compromise, data leakage, and can severely disrupt network services.<\/p>\n

Vulnerability Summary<\/strong><\/p>\n

CVE ID: CVE-2023-43511
\nSeverity: High (CVSS score of 7.5)
\nAttack Vector: Network
\nPrivileges Required: None
\nUser Interaction: None
\nImpact: A successful exploit can lead to a denial of service, potential system compromise or data leakage.<\/p>\n

Affected Products<\/strong><\/p>\n

Product | Affected Versions<\/p>\n

WLAN Firmware | All versions prior to the vendor patch<\/p>\n

How the Exploit Works<\/strong><\/p>\n

The CVE-2023-43511 vulnerability is exploited when the WLAN firmware receives an IPv6 packet that includes `IPPROTO_NONE` as the next header. The firmware’s failure to handle such packets correctly leads to transient DOS. An attacker can exploit this vulnerability to cause a denial of service, which can further lead to potential system compromise or data leakage.<\/p>\n

Conceptual Example Code<\/strong><\/p>\n

An attacker could send specially crafted IPv6 packets to the target system to exploit the vulnerability. This is a conceptual example and does not represent actual exploit code:<\/p>\n

#!\/bin\/bash\n# Destination IP address\nDEST=\"2001:0db8:85a3:0000:0000:8a2e:0370:7334\"\n# Crafted IPv6 packet with IPPROTO_NONE in the next header field\necho -e \"`printf '\\\\x60\\\\x00\\\\x00\\\\x00\\\\x00\\\\x00\\\\x3b\\\\x00'`\" | nc -u -w 1 $DEST 12345<\/code><\/pre>\n
This shell script sends an IPv6 packet with `IPPROTO_NONE` (0x3b) as the next header to the target system, potentially triggering the vulnerability.<\/p>\n","protected":false},"excerpt":{"rendered":"
Overview The vulnerability identified as CVE-2023-43511 is a significant threat to the cybersecurity landscape. It is a Denial of Service (DOS) vulnerability that occurs during the parsing of an IPv6 extension header in the WLAN firmware. Should a system receive an IPv6 packet that contains `IPPROTO_NONE` as the next header, a transient DOS can occur. […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"footnotes":""},"categories":[],"tags":[],"vendor":[],"product":[],"attack_vector":[],"asset_type":[],"severity":[],"exploit_status":[],"class_list":["post-86061","post","type-post","status-publish","format-standard","hentry"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t