Vulnerability-Lookup

OESA-2026-2612 (CVE-2023-4421)

Vulnerability from osv_openeuler – Published: 2026-06-12 11:11 – Updated: 2026-08-06 11:11 – Source website

Summary

nss security update

Details

Network Security Services (NSS) is a set of libraries designed to support cross-platform development of security-enabled client and server applications. Applications built with NSS can support SSL v2 and v3, TLS, PKCS #5, PKCS #7, PKCS #11, PKCS #12, S/MIME, X.509 v3 certificates, and other security standards.

Security Fix(es):

The NSS code used for checking PKCS#1 v1.5 was leaking information useful in mounting Bleichenbacher-like attacks. Both the overall correctness of the padding as well as the length of the encrypted message was leaking through timing side-channel. By sending large number of attacker-selected ciphertexts, the attacker would be able to decrypt a previously intercepted PKCS#1 v1.5 ciphertext (for example, to decrypt a TLS session that used RSA key exchange), or forge a signature using the victim's key. The issue was fixed by implementing the implicit rejection algorithm, in which the NSS returns a deterministic random message in case invalid padding is detected, as proposed in the Marvin Attack paper. This vulnerability affects NSS < 3.61.(CVE-2023-4421)

Severity

6.5 (Medium)


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

References

URL

Type

	https://www.openeuler.org/zh/security/security-bu…	ADVISORY
	https://nvd.nist.gov/vuln/detail/CVE-2023-4421	ADVISORY

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "aarch64": [
          "nss-3.54.0-13.oe2003sp4.aarch64.rpm",
          "nss-debuginfo-3.54.0-13.oe2003sp4.aarch64.rpm",
          "nss-debugsource-3.54.0-13.oe2003sp4.aarch64.rpm",
          "nss-devel-3.54.0-13.oe2003sp4.aarch64.rpm",
          "nss-help-3.54.0-13.oe2003sp4.aarch64.rpm",
          "nss-softokn-3.54.0-13.oe2003sp4.aarch64.rpm",
          "nss-softokn-devel-3.54.0-13.oe2003sp4.aarch64.rpm",
          "nss-util-3.54.0-13.oe2003sp4.aarch64.rpm",
          "nss-util-devel-3.54.0-13.oe2003sp4.aarch64.rpm"
        ],
        "src": [
          "nss-3.54.0-13.oe2003sp4.src.rpm"
        ],
        "x86_64": [
          "nss-3.54.0-13.oe2003sp4.x86_64.rpm",
          "nss-debuginfo-3.54.0-13.oe2003sp4.x86_64.rpm",
          "nss-debugsource-3.54.0-13.oe2003sp4.x86_64.rpm",
          "nss-devel-3.54.0-13.oe2003sp4.x86_64.rpm",
          "nss-help-3.54.0-13.oe2003sp4.x86_64.rpm",
          "nss-softokn-3.54.0-13.oe2003sp4.x86_64.rpm",
          "nss-softokn-devel-3.54.0-13.oe2003sp4.x86_64.rpm",
          "nss-util-3.54.0-13.oe2003sp4.x86_64.rpm",
          "nss-util-devel-3.54.0-13.oe2003sp4.x86_64.rpm"
        ]
      },
      "package": {
        "ecosystem": "openEuler:20.03-LTS-SP4",
        "name": "nss",
        "purl": "pkg:rpm/openEuler/nss\u0026distro=openEuler-20.03-LTS-SP4"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "3.54.0-13.oe2003sp4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "severity": "Medium"
  },
  "details": "Network Security Services (NSS) is a set of libraries designed to support cross-platform development of security-enabled client and server applications. Applications built with NSS can support SSL v2 and v3, TLS, PKCS #5, PKCS #7, PKCS #11, PKCS #12, S/MIME, X.509 v3 certificates, and other security standards.\r\n\r\nSecurity Fix(es):\n\nThe NSS code used for checking PKCS#1 v1.5 was leaking information useful in mounting Bleichenbacher-like attacks. Both the overall correctness of the padding as well as the length of the encrypted message was leaking through timing side-channel. By sending large number of attacker-selected ciphertexts, the attacker would be able to decrypt a previously intercepted PKCS#1 v1.5 ciphertext (for example, to decrypt a TLS session that used RSA key exchange), or forge a signature using the victim\u0026apos;s key. The issue was fixed by implementing the implicit rejection algorithm, in which the NSS returns a deterministic random message in case invalid padding is detected, as proposed in the Marvin Attack paper. This vulnerability affects NSS \u0026lt; 3.61.(CVE-2023-4421)",
  "id": "OESA-2026-2612",
  "modified": "2026-08-06T11:11:33Z",
  "published": "2026-06-12T11:11:33Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-2612"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2023-4421"
    }
  ],
  "schema_version": "1.7.2",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "nss security update",
  "upstream": [
    "CVE-2023-4421"
  ]
}

CVE-2023-4421 (GCVE-0-2023-4421)

Vulnerability from cvelistv5 – Published: 2023-12-12 17:02 – Updated: 2025-11-04 19:25

Summary

Severity

No CVSS data available.

CWE

Timing side-channel in PKCS#1 v1.5 decryption depadding code

Assigner

mozilla mitre root

References

3 references

URL	Tags
https://bugzilla.mozilla.org/show_bug.cgi?id=1651411
https://www.mozilla.org/security/advisories/mfsa2…
https://lists.debian.org/debian-lts-announce/2023…

Impacted products

1 product

Vendor	Product	Version
Mozilla	NSS	Affected: unspecified , < 3.61 (custom)

Credits

Hubert Kario

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2025-11-04T19:25:18.220Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
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        "references": [
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            "tags": [
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            "url": "https://bugzilla.mozilla.org/show_bug.cgi?id=1651411"
          },
          {
            "tags": [
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            ],
            "url": "https://www.mozilla.org/security/advisories/mfsa2023-53/"
          },
          {
            "url": "https://lists.debian.org/debian-lts-announce/2023/10/msg00039.html"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "NSS",
          "vendor": "Mozilla",
          "versions": [
            {
              "lessThan": "3.61",
              "status": "affected",
              "version": "unspecified",
              "versionType": "custom"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "value": "Hubert Kario"
        }
      ],
      "descriptions": [
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              "type": "text/html",
              "value": "The NSS code used for checking PKCS#1 v1.5 was leaking information useful in mounting Bleichenbacher-like attacks. Both the overall correctness of the padding as well as the length of the encrypted message was leaking through timing side-channel. By sending large number of attacker-selected ciphertexts, the attacker would be able to decrypt a previously intercepted PKCS#1 v1.5 ciphertext (for example, to decrypt a TLS session that used RSA key exchange), or forge a signature using the victim\u0027s key. The issue was fixed by implementing the implicit rejection algorithm, in which the NSS returns a deterministic random message in case invalid padding is detected, as proposed in the Marvin Attack paper. This vulnerability affects NSS \u003c 3.61."
            }
          ],
          "value": "The NSS code used for checking PKCS#1 v1.5 was leaking information useful in mounting Bleichenbacher-like attacks. Both the overall correctness of the padding as well as the length of the encrypted message was leaking through timing side-channel. By sending large number of attacker-selected ciphertexts, the attacker would be able to decrypt a previously intercepted PKCS#1 v1.5 ciphertext (for example, to decrypt a TLS session that used RSA key exchange), or forge a signature using the victim\u0027s key. The issue was fixed by implementing the implicit rejection algorithm, in which the NSS returns a deterministic random message in case invalid padding is detected, as proposed in the Marvin Attack paper. This vulnerability affects NSS \u003c 3.61."
        }
      ],
      "problemTypes": [
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          "url": "https://www.mozilla.org/security/advisories/mfsa2023-53/"
        }
      ]
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    "assignerShortName": "mozilla",
    "cveId": "CVE-2023-4421",
    "datePublished": "2023-12-12T17:02:08.801Z",
    "dateReserved": "2023-08-18T13:25:38.056Z",
    "dateUpdated": "2025-11-04T19:25:18.220Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.