RCE in Dlink Dir-2640-Us
CVE-2021-34203
D-Link DIR-2640-US 1.01B04 is vulnerable to Incorrect Access Control. Router ac2600 (dir-2640-us), when setting PPPoE, will start quagga process in the way of whole network monitoring, and this function uses the original default password and port. An attacker can easily use telnet to log in, modify routing information, monitor the traffic of all devices under the router, hijack DNS and phishing attacks. In addition, this interface is likely to be questioned by customers as a backdoor, because the interface should not be exposed.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N.
EPSS exploit prediction
EPSS: 0.012 (66.8th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 67th percentile — 66.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.012 · newest: 0.012 · change: 0.000
Affected products
- Dlink Dir-2640-Us
- Dlink Dir-2640-Us Firmware — versions 1.01b04
Weakness classification (CWE)
Public proof-of-concept exploits
References
- af854a3a-2127-422b-91ae-364da2661108 (Vendor Advisory)
- www.dlink.com/en/security-bulletin/ (Vendor Advisory)
- af854a3a-2127-422b-91ae-364da2661108 (URL Repurposed, Broken Link)
- github.com/liyansong2018/CVE/tree/main/2021/CVE-2021-34203 (Exploit, Third Party Advisory)
Frequently asked questions
- What is CVE-2021-34203?
- CVE-2021-34203 is a high-severity vulnerability in Dlink Dir-2640-Us, classified under Initialization of a Resource with an Insecure Default. CVSS score: 8.1/10. Published 2021-06-16.
- How severe is CVE-2021-34203?
- High severity. CVSS v3 base score is 8.1 out of 10.
- Is CVE-2021-34203 known to be exploited?
- 5 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.