#VU56148 Improper Check for Unusual or Exceptional Conditions in envoy - CVE-2021-32780

Vulnerability identifier: #VU56148

Vulnerability risk: Medium

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2021-32780

CWE-ID: CWE-754

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
envoy
Server applications / IDS/IPS systems, Firewalls and proxy servers

Vendor: Cloud Native Computing Foundation

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to incorrect handling of H/2 GOAWAY followed by SETTINGS frames. A remote attacker can cause a denial of service condition on the target system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

envoy: 1.18.0 - 1.19.0

---

External links
https://github.com/envoyproxy/envoy/security/advisories/GHSA-j374-mjrw-vvp8
https://www.envoyproxy.io/docs/envoy/v1.19.0/version_history/version_history

---

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.