#VU77807 Out-of-bounds read in SQLite - CVE-2021-31239

Vulnerability identifier: #VU77807

Vulnerability risk: Low

CVSSv4.0: 4.3 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2021-31239

CWE-ID: CWE-125

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
SQLite
Server applications / Database software

Vendor: SQLite

Description

The vulnerability allows a local user to perform a denial of service (DoS) attack.

The vulnerability exists due to a boundary condition in ext/misc/appendvfs.c. A local user can trigger an out-of-bounds read error and crash the database.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

SQLite: 3.35.2 - 3.35.5

---

External links
https://github.com/Tsiming/Vulnerabilities/blob/main/SQLite/CVE-2021-31239
https://www.sqlite.org/forum/forumpost/d9fce1a89b
https://www.sqlite.org/src/info/04f6439f4d9b9b1f

---

Q & A

Can this vulnerability be exploited remotely?

Is there known malware, which exploits this vulnerability?