ubuntu-cve-2020-25648
Vulnerability from osv_ubuntu
Published
2020-10-20 22:15
Modified
2026-04-22 07:39
Summary
Details

A flaw was found in the way NSS handled CCS (ChangeCipherSpec) messages in TLS 1.3. This flaw allows a remote attacker to send multiple CCS messages, causing a denial of service for servers compiled with the NSS library. The highest threat from this vulnerability is to system availability. This flaw affects NSS versions before 3.58.

Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
N/A (UNKNOWN)
low
References
To clipboard 

{
  "affected": [
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "libnss3",
            "binary_version": "2:3.35-2ubuntu2.14"
          },
          {
            "binary_name": "libnss3-tools",
            "binary_version": "2:3.35-2ubuntu2.14"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:18.04:LTS",
        "name": "nss",
        "purl": "pkg:deb/ubuntu/nss@2:3.35-2ubuntu2.14?arch=source\u0026distro=bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2:3.35-2ubuntu2.14"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2:3.32-1ubuntu3",
        "2:3.34-1ubuntu1",
        "2:3.35-2ubuntu2",
        "2:3.35-2ubuntu2.1",
        "2:3.35-2ubuntu2.2",
        "2:3.35-2ubuntu2.3",
        "2:3.35-2ubuntu2.5",
        "2:3.35-2ubuntu2.6",
        "2:3.35-2ubuntu2.7",
        "2:3.35-2ubuntu2.8",
        "2:3.35-2ubuntu2.9",
        "2:3.35-2ubuntu2.11",
        "2:3.35-2ubuntu2.12",
        "2:3.35-2ubuntu2.13"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "libnss3",
            "binary_version": "2:3.49.1-1ubuntu1.7"
          },
          {
            "binary_name": "libnss3-tools",
            "binary_version": "2:3.49.1-1ubuntu1.7"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:20.04:LTS",
        "name": "nss",
        "purl": "pkg:deb/ubuntu/nss@2:3.49.1-1ubuntu1.7?arch=source\u0026distro=focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2:3.49.1-1ubuntu1.7"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2:3.45-1ubuntu2",
        "2:3.47-1ubuntu1",
        "2:3.47-1ubuntu2",
        "2:3.48-1ubuntu1",
        "2:3.49.1-1ubuntu1",
        "2:3.49.1-1ubuntu1.1",
        "2:3.49.1-1ubuntu1.2",
        "2:3.49.1-1ubuntu1.4",
        "2:3.49.1-1ubuntu1.5",
        "2:3.49.1-1ubuntu1.6"
      ]
    }
  ],
  "aliases": [],
  "details": "A flaw was found in the way NSS handled CCS (ChangeCipherSpec) messages in TLS 1.3. This flaw allows a remote attacker to send multiple CCS messages, causing a denial of service for servers compiled with the NSS library. The highest threat from this vulnerability is to system availability. This flaw affects NSS versions before 3.58.",
  "id": "UBUNTU-CVE-2020-25648",
  "modified": "2026-04-22T07:39:32Z",
  "published": "2020-10-20T22:15:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2020-25648"
    },
    {
      "type": "REPORT",
      "url": "https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSS/NSS_3.58_release_notes"
    },
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-5410-1"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2020-25648"
    }
  ],
  "related": [
    "USN-5410-1"
  ],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "low",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2020-25648"
  ]
}



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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
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