CVE-2020-1913 Signed to Unsigned Conversion Error in Facebook Hermes
An integer signedness error in the Hermes JavaScript engine allows attackers to cause denial of service or remote code execution via crafted JavaScript in applications permitting untrusted code evaluation.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2020-1913?
CVE-2020-1913 is a high-severity vulnerability in Facebook Hermes, published on 9 Sep 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
An Integer signedness error in the JavaScript Interpreter in Facebook Hermes prior to commit 2c7af7ec481ceffd0d14ce2d7c045e475fd71dc6 allows attackers to cause a denial of service attack or a potential RCE 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.
Which versions are affected by CVE-2020-1913?
2 open source packages ship an affected version, including hermes-engine. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
hermes-engine npm | All versions | 0.5.2 |
hermes-engine npm | All versions | 0.5.2 |
Products include Facebook Hermes.
How do I fix CVE-2020-1913?
Upgrade hermes-engine to 0.5.2 or later.
Is CVE-2020-1913 being exploited?
There is no known exploitation of CVE-2020-1913 in the wild and no public exploit code.
Other vulnerabilities in Facebook Hermes
Sources
Also known as GHSA-gmpm-xp43-f7g6.