RCE in D-Link Dir-818lw Firmware
CVE-2018-19986
In the /HNAP1/SetRouterSettings message, the RemotePort parameter is vulnerable, and the vulnerability affects D-Link DIR-818LW Rev.A 2.05.B03 and DIR-822 B1 202KRb06 devices. In the SetRouterSettings.php source code, the RemotePort parameter is saved in the $path_inf_wan1."/web" internal configuration memory without any regex checking. And in the IPTWAN_build_command function of the iptwan.php source code, the data in $path_inf_wan1."/web" is used with the iptables command without any regex checking. A vulnerable /HNAP1/SetRouterSettings XML message could have shell metacharacters in the RemotePort element such as the `telnetd` string.
Vulnerability class: Command Injection (OS Command Injection)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.416 (98.6th percentile), scored .
Moderate probability of exploitation in the next 30 days — watch for active exploitation reports. 99th percentile — 98.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.416 · newest: 0.416 · change: 0.000
Affected products
- D-Link Dir-818lw Firmware — versions 2.05.b03
- D-Link Dir-822 Firmware — versions 202krb06
- Dlink Dir-818lw
- Dlink Dir-822
Weakness classification (CWE)
Public proof-of-concept exploits
References
- github.com/pr0v3rbs/CVE/tree/master/CVE-2018-19986 - 19990 (Exploit, Third Party Advisory)
Frequently asked questions
- What is CVE-2018-19986?
- CVE-2018-19986 is a critical-severity vulnerability in D-Link Dir-818lw Firmware, classified under OS Command Injection. CVSS score: 9.8/10. Published 2019-05-13.
- How severe is CVE-2018-19986?
- Critical severity. CVSS v3 base score is 9.8 out of 10.
- Is CVE-2018-19986 known to be exploited?
- 6 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.