CVE-2021-3689 Use of Predictable Algorithm in Random Number Generator in yiisoft/yii2
High 8.1
Published
Updated
Check this codebase for CVE-2021-3689 and fix it if it is affected.
What it is: CVE-2021-3689 is a high-severity vulnerability in yiisoft/yii2, published on 10 Aug 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2021-3689 in the wild and no public exploit code.
Affected packages and fixed versions:
- yiisoft/yii2-dev (Packagist): affected all versions; fixed in 2.0.43
- yiisoft/yii2-dev (Packagist): affected all versions; fixed in 2.0.43
Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.
Reference: https://insights.sbomify.com/CVE-2021-3689/ (Markdown: https://insights.sbomify.com/CVE-2021-3689/index.md)
The Yii2 framework uses a predictable random number generator, potentially allowing attackers to bypass security mechanisms relying on randomness.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2021-3689?
CVE-2021-3689 is a high-severity vulnerability in yiisoft/yii2, published on 10 Aug 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
yii2 is vulnerable to Use of Predictable Algorithm in Random Number Generator
Which versions are affected by CVE-2021-3689?
2 open source packages ship an affected version, including yiisoft/yii2-dev. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
yiisoft/yii2-dev Packagist | All versions | 2.0.43 |
yiisoft/yii2-dev Packagist | All versions | 2.0.43 |
Products include Yiiframework Yii.
How do I fix CVE-2021-3689?
Upgrade yiisoft/yii2-dev to 2.0.43 or later.
Is CVE-2021-3689 being exploited?
There is no known exploitation of CVE-2021-3689 in the wild and no public exploit code.
Other vulnerabilities in yiisoft/yii2
- CVE-2024-58136 Yiiframework Yii Improper Protection of Alternate Path
- CVE-2015-5467 Yii2 allows attackers to execute any local .php file via a relative path in the view parameter
- CVE-2023-26750 SQL injection in n/a
- CVE-2018-7269 Yii SQL injection vulnerability
- CVE-2018-8073 yii2-redis Potential Remote code execution
Sources
Also known as GHSA-hq3v-rg6f-6hx4.