What is CVE-2020-12413?

CVE-2020-12413 is a medium-severity vulnerability in Mozilla Firefox, classified under Observable Discrepancy. CVSS score: 5.9/10. Published 2023-02-16.

How severe is CVE-2020-12413?

Medium severity. CVSS v3 base score is 5.9 out of 10.

Vulnerability in Mozilla Firefox

CVE-2020-12413

The Raccoon attack is a timing attack on DHE ciphersuites inherit in the TLS specification. To mitigate this vulnerability, Firefox disabled support for DHE ciphersuites.

Published 2023-02-16 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.006 (46.4th percentile), scored 2026-10-01.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 46th percentile — 46.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000

Affected products

Mozilla Firefox — versions unspecified
Mozilla Firefox Esr — versions unspecified
Mozilla Firefox Esr

Weakness classification (CWE)

CWE-203 — Observable Discrepancy

References

raccoon-attack.com/ (Technical Description)
bugzilla.mozilla.org/show_bug.cgi (Issue Tracking)

Frequently asked questions

What is CVE-2020-12413?: CVE-2020-12413 is a medium-severity vulnerability in Mozilla Firefox, classified under Observable Discrepancy. CVSS score: 5.9/10. Published 2023-02-16.
How severe is CVE-2020-12413?: Medium severity. CVSS v3 base score is 5.9 out of 10.