CVE-2020-1915 Out-of-bounds Read in Facebook Hermes
Attackers can cause denial of service or memory corruption in Hermes JavaScript engine via crafted scripts if untrusted code evaluation is enabled.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2020-1915?
CVE-2020-1915 is a high-severity memory corruption vulnerability in Facebook Hermes, published on 26 Oct 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
An out-of-bounds read in the JavaScript Interpreter in Facebook Hermes prior to commit 8cb935cd3b2321c46aa6b7ed8454d95c75a7fca0 allows attackers to cause a denial of service attack or possible further memory corruption via crafted JavaScript. Note that this is only exploitable if the application using Hermes permits evaluation of untrusted JavaScript. Hence, most React Native applications are not affected.
Weakness: CWE-125
Which versions are affected by CVE-2020-1915?
2 open source packages ship an affected version, including hermes-engine. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
hermes-engine npm | All versions | 0.7.2 |
hermes-engine npm | All versions | 0.7.2 |
Products include Facebook Hermes.
How do I fix CVE-2020-1915?
Upgrade hermes-engine to 0.7.2 or later.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2020-1915 being exploited?
There is no known exploitation of CVE-2020-1915 in the wild and no public exploit code.
Other vulnerabilities in Facebook Hermes
Sources
Also known as GHSA-x4cf-6jr3-3qvp.