CVE-2021-27420 GE UR family input validation

What is CVE-2021-27420?

CVE-2021-27420 is a medium-severity denial of service vulnerability in GE UR family, published on 23 Mar 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

GE UR firmware versions prior to version 8.1x web server task does not properly handle receipt of unsupported HTTP verbs, resulting in the web server becoming temporarily unresponsive after receiving a series of unsupported HTTP requests. When unresponsive, the web server is inaccessible. By itself, this is not particularly significant as the relay remains effective in all other functionality and communication channels.

Weakness: CWE-20

Which versions are affected by CVE-2021-27420?

It affects 19 products.

Products include Ge Multilin B30 Firmware, Ge Multilin B90 Firmware, Ge Multilin C30 Firmware, Ge Multilin C60 Firmware, Ge Multilin C70 Firmware, Ge Multilin C95 Firmware and 13 more.

How do I fix CVE-2021-27420?

No fix has been published for CVE-2021-27420 yet. Limit exposure of the affected software until one is available.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2021-27420 being exploited?

There is no known exploitation of CVE-2021-27420 in the wild and no public exploit code.

Other vulnerabilities in GE UR family

• CVE-2021-27426 GE UR family insecure default variable initialization Critical 9.8
• CVE-2021-27428 GE UR family Unrestricted Upload of File with Dangerous Type Critical 9.8
• CVE-2021-27422 GE UR family exposure of sensitive information to an unauthorized actor High 7.5
• CVE-2021-27418 GE UR family input validation Medium 5.3
• CVE-2021-27424 GE UR family exposure of sensitive information to an unauthorized actor Medium 5.3

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-vw3w-wmxj-qpxw.