#VU76723 Memory leak in Nanopb - CVE-2020-26243

Vulnerability identifier: #VU76723

Vulnerability risk: Medium

CVSSv4.0: 7.7 [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:P/U:Green]

CVE-ID: CVE-2020-26243

CWE-ID: CWE-401

Exploitation vector: Network

Exploit availability: Yes

Vulnerable software:
Nanopb
Web applications / JS libraries

Vendor: Nanopb Project

Description
The vulnerability allows a remote attacker to perform DoS attack on the target system.

The vulnerability exists due memory leak. A remote attacker can force the application to leak memory and perform denial of service attack.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Nanopb: 0.3.6 - 0.3.9.6, 0.4.0 - 0.4.3

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External links
https://github.com/nanopb/nanopb/blob/2b48a361786dfb1f63d229840217a93aae064667/CHANGELOG.txt
https://github.com/nanopb/nanopb/commit/4fe23595732b6f1254cfc11a9b8d6da900b55b0c
https://github.com/nanopb/nanopb/issues/615
https://github.com/nanopb/nanopb/security/advisories/GHSA-85rr-4rh9-hhwh

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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. However, proof of concept for this vulnerability is available.