Critical Vulnerability in HP VoIP Phones Allows Network Breaches
A critical stack-based buffer overflow vulnerability (CVE-2026-0826) in HP Poly VoIP phones enables remote code execution, potentially granting attackers a foothold in enterprise networks.
Multiple models of HP Poly Voice VoIP phones are affected by a critical-severity vulnerability that allows for remote code execution with root privileges, potentially enabling attackers to gain a significant foothold within enterprise networks. The flaw, tracked as CVE-2026-0826 and assigned a CVSS score of 9.2, is a stack-based buffer overflow that occurs during the parsing of Session Description Protocol (SDP) attributes when the Interactive Connectivity Establishment (ICE) feature is enabled.
The vulnerability stems from a function responsible for parsing candidate attributes within SDP data. This function copies incoming string data into a fixed-size buffer on the stack without performing length validation. Consequently, an attacker can craft a malicious candidate attribute exceeding the buffer's capacity, triggering the overflow.
Exploitation involves sending a specially crafted SIP INVITE request containing this oversized candidate attribute. Successful exploitation leads to a program crash, granting the attacker control over the program counter and registers. To bypass security mitigations like Address Space Layout Randomization (ASLR) and No Execute (NX), attackers can employ Return Oriented Programming (ROP) chains, ultimately achieving arbitrary code execution.
The affected devices include HP VVX series phones (VVX 150, 250, 350, and 450) and Trio IP Conference series phones (Trio 8800, 8500, and 8300). Fortunately, patches are available from HP for all impacted models.
As a mitigation, organizations can disable ICE connectivity if it is not strictly required for their operations. However, the most effective solution is to update the firmware on Poly Voice devices to a patched release. Administrators are strongly advised to implement these updates promptly.
Rapid7 highlighted the significant risk posed by these devices due to their placement within inherently trusted environments such as conference rooms, executive offices, and help desks. Compromising these endpoints offers more than just device access; it provides a gateway into the broader enterprise network.
These VoIP phones often lack endpoint protection software, making them ideal targets for establishing persistent footholds. Attackers can leverage this access to intercept sensitive communications, move laterally within the network, and potentially gather information for further social engineering attacks, including vishing or the creation of deepfakes.
The implications extend to potential financial fraud, as compromised devices could be used to eavesdrop on discussions related to financial authorizations or to impersonate executives for fraudulent transactions. The widespread deployment of these devices in corporate environments underscores the critical need for prompt patching and security vigilance.