CVE-2023-40021 is a timing attack vulnerability in Oppia, an online learning platform, affecting versions prior to 3.3.2-hotfix-2. The vulnerability arises from the insecure comparison of CSRF tokens, allowing an attacker to brute-force the token character by character. This medium-severity flaw (CVSS 5.3) requires user interaction (UI:R) and high attack complexity (AC:H), but successful exploitation could lead to high integrity impact (I:H), enabling an attacker to perform privileged actions on behalf of a logged-in user. There is no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
>= 1.1.0, < 3.3.2CPE matchmatch criteria | cpe:2.3:a:oppia:oppia:*:*:*:*:*:*:*:* | ||
3.3.2CPE matchmatch criteria | cpe:2.3:a:oppia:oppia:3.3.2:-:*:*:*:*:*:* |
CVSS version used by this source: 3.1
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N
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The average CVE in this peer group has 0.2 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.