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CVE-2020-12403

nss: CHACHA20-POLY1305 decryption with undersized tag leads to out-of-bounds read

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Severity

Moderate

Red Hat Product Security

7.4

CVSS 3.1

Review impact separately from score.

Published · July 27, 2020

Updated · June 27, 2026

Description

A flaw was found in the way CHACHA20-POLY1305 was implemented in NSS. When using multi-part Chacha20, it could cause out-of-bounds reads. This issue was fixed by explicitly disabling multi-part ChaCha20 (which was not functioning correctly) and strictly enforcing tag length. The highest threat from this vulnerability is to confidentiality and system availability.

CVSS score applicability

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation

No mitigation is specified in collected source.

CVSS / CWE

CVSS 3.1 · 7.4
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:H

CWE-125 · Out-of-bounds Read