CVE-2023-43959
Published: 17 October 2023
Summary
CVE-2023-43959 is a high-severity OS Command Injection (CWE-78) vulnerability in Yealink Sip-T19P-E2 Firmware. Its CVSS base score is 8.8 (High).
Operationally, ranked in the top 7.7% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.
Deeper analysis
CVE-2023-43959 affects the Yealink SIP-T19P-E2 VoIP phone running firmware version 53.84.0.15. The flaw resides in the ping function of the device's diagnostic component and stems from improper neutralization of special elements used in an OS command (CWE-78). A remote attacker can supply a crafted request that results in arbitrary code execution on the device.
An attacker with low-privileged network access and no user interaction can exploit the issue to obtain full control over the affected phone. Successful exploitation yields high impact on confidentiality, integrity, and availability, consistent with the CVSS 8.8 rating.
Public proof-of-concept code is available on Exploit-DB and detailed write-ups exist on HackMD, confirming that the vulnerability can be triggered remotely once an attacker reaches the diagnostic interface. The EPSS score has remained flat at 0.0799 with no material increase observed after disclosure.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2023-48319
Vulnerability details
An issue in YeaLinkSIP-T19P-E2 v.53.84.0.15 allows a remote privileged attacker to execute arbitrary code via a crafted request the ping function of the diagnostic component.
- CWE(s)
Related Threats
No named actor attribution yet. ATT&CK technique mapping in progress for this CVE.
Affected Assets
Mitigating Controls
Likely Mitigating Controls AI
Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.