{"id":64214,"date":"2025-08-21T11:13:54","date_gmt":"2025-08-21T11:13:54","guid":{"rendered":""},"modified":"2025-09-03T03:47:09","modified_gmt":"2025-09-03T09:47:09","slug":"cve-2025-50518-critical-use-after-free-vulnerability-in-libcoap-library","status":"publish","type":"post","link":"https:\/\/www.ameeba.com\/blog\/cve-2025-50518-critical-use-after-free-vulnerability-in-libcoap-library\/","title":{"rendered":"CVE-2025-50518: Critical Use-After-Free Vulnerability in libcoap Library<\/strong>"},"content":{"rendered":"

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

The cybersecurity landscape is witnessing a new vulnerability that poses a significant threat to the data integrity and system security of numerous devices and applications. The vulnerability, identified as CVE-2025-50518, affects the libcoap library, widely used in embedded systems and IoT devices for the Constrained Application Protocol (CoAP). This vulnerability can lead<\/a> to severe outcomes, including potential system compromise and data leakage. Given the ubiquitous use of libcoap in a range of devices, the implications of this vulnerability are far-reaching and demand immediate attention.<\/p>\n

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

CVE ID: CVE-2025-50518
\nSeverity: Critical (9.8 CVSS Score)
\nAttack Vector: Network
\nPrivileges Required: None
\nUser Interaction: None
\nImpact: Potential system<\/a> compromise, data leakage<\/p>\n

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

Product | Affected Versions<\/p>\n

libcoap | All versions prior<\/a> to patch<\/p>\n

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

The exploit leverages a use-after-free vulnerability in the coap_delete_pdu_lkd function within the coap_pdu.c file of the libcoap<\/a> library. This vulnerability arises due to the improper handling of memory<\/a> after the freeing of a Protocol Data Unit (PDU) object.
\nAn attacker can manipulate this vulnerability by creating a malicious payload that causes the system<\/a> to access the free memory space associated with the PDU object. This action can lead to memory corruption<\/a> or even the execution of arbitrary code, paving the way for a potential system compromise or data leakage.<\/p>\n

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

The following is a conceptual example of how the vulnerability might be exploited. It’s important to note that this is a conceptual example and not actual exploit code.<\/p>\n

#include \n...\ncoap_pdu_t *pdu;\npdu = coap_new_pdu(session);\n...\n\/\/ Malicious function that exploits the use-after-free vulnerability\nvoid exploit(coap_pdu_t *pdu) {\ncoap_delete_pdu(session, pdu); \/\/ Free the pdu\n\/\/ Perform an operation on the freed pdu, causing use-after-free\nunsigned char *data = pdu->data;\n}\n...\nexploit(pdu);<\/code><\/pre>\n
Mitigation Guidance<\/strong><\/p>\n
Users are strongly advised to apply the vendor patch as soon as possible for the most effective mitigation. In the interim, employing a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can serve as a temporary mitigation strategy. These tools can help detect and prevent attempts to exploit the vulnerability<\/a>. However, these are not foolproof solutions and do not substitute the need for applying the vendor patch.<\/p>\n","protected":false},"excerpt":{"rendered":"
Overview The cybersecurity landscape is witnessing a new vulnerability that poses a significant threat to the data integrity and system security of numerous devices and applications. The vulnerability, identified as CVE-2025-50518, affects the libcoap library, widely used in embedded systems and IoT devices for the Constrained Application Protocol (CoAP). This vulnerability can lead to severe […]<\/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":[1],"tags":[],"vendor":[],"product":[],"attack_vector":[],"asset_type":[],"severity":[],"exploit_status":[],"class_list":["post-64214","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"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