A flaw was found in the way CHACHA20-POLY1305 was implemented in NSS in versions before 3.55. 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.

CNA Affected

[
  {
    "vendor": "n/a",
    "product": "nss",
    "versions": [
      {
        "version": "nss 3.55",
        "status": "affected"
      }
    ]
  }
]