What is CVE-2021-46477?

CVE-2021-46477 is a medium-severity vulnerability in Jsish, classified under Out-of-bounds Write. CVSS score: 5.5/10. Published 2022-01-25.

How severe is CVE-2021-46477?

Medium severity. CVSS v3 base score is 5.5 out of 10.

Buffer overflow in Jsish

CVE-2021-46477

Jsish v3.5.0 was discovered to contain a heap buffer overflow via RegExp_constructor in src/jsiRegexp.c. This vulnerability can lead to a Denial of Service (DoS).

Vulnerability class: Buffer Overflow

Published 2022-01-25 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.007 (50.9th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 51st percentile — 50.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: 0.000

Affected products

Jsish — versions 3.5.0

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

References

github.com/pcmacdon/jsish/issues/63 (Exploit, Patch, Third Party Advisory)

Frequently asked questions

What is CVE-2021-46477?: CVE-2021-46477 is a medium-severity vulnerability in Jsish, classified under Out-of-bounds Write. CVSS score: 5.5/10. Published 2022-01-25.
How severe is CVE-2021-46477?: Medium severity. CVSS v3 base score is 5.5 out of 10.