CVE-2021-29940 Double free in through
A double free vulnerability in the Rust through crate allows attackers to cause denial of service or potentially execute code via a panic in the map function.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2021-29940?
CVE-2021-29940 is a critical use after free vulnerability in n/a, published on 1 Apr 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
An issue was discovered in the through crate through 2021-02-18 for Rust. There is a double free (in through and through_and) upon a panic of the map function.
Weakness: CWE-415
Which versions are affected by CVE-2021-29940?
3 open source packages ship an affected version, including through. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
through crates.io | All versions to 0.1.0 | None |
through crates.io | All versions to 0.1.0 | None |
through crates.io | From 0.0.0-0 | None |
Products include Through Project Through.
How do I fix CVE-2021-29940?
No fix has been published for CVE-2021-29940 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.
Is CVE-2021-29940 being exploited?
There is no known exploitation of CVE-2021-29940 in the wild and no public exploit code.
Sources
Also known as GHSA-5hpj-m323-cphm, RUSTSEC-2021-0049.