Vulnerability-Lookup

CVE-2026-3337 (GCVE-0-2026-3337)

Vulnerability from cvelistv5 – Published: 2026-03-02 21:20 – Updated: 2026-03-03 20:04

Title

Timing Side-Channel in AES-CCM Tag Verification in AWS-LC

Summary

Observable timing discrepancy in AES-CCM decryption in AWS-LC allows an unauthenticated user to potentially determine authentication tag validity via timing analysis. The impacted implementations are through the EVP CIPHER API: EVP_aes_128_ccm, EVP_aes_192_ccm, and EVP_aes_256_ccm. Customers of AWS services do not need to take action. Applications using AWS-LC should upgrade to AWS-LC version 1.69.0.

Severity

5.9 (Medium)


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

8.2 (High)


                        
                          CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-03-03 20:03 UTC

CWE

CWE-208 - (Observable Timing Discrepancy)

Assigner

AMZN CNA under the mitre root

CNA scorecard A 94/100 over 163 records in the last 180 days details

References

3 references

URL	Tags
https://aws.amazon.com/security/security-bulletin…	vendor-advisory
https://github.com/aws/aws-lc/releases/tag/v1.69.0	patch
https://github.com/aws/aws-lc/security/advisories…	third-party-advisory

Impacted products

2 products

Vendor	Product	Version	CPE status
AWS	AWS-LC	Affected: 1.21.0 , < 1.69.0 (custom)	guessed
AWS	AWS-LC-FIPS	Affected: 3.0.0 , < 3.2.0 (custom)	guessed

Show details on NVD website

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            "orgId": "ff89ba41-3aa1-4d27-914a-91399e9639e5",
            "shortName": "AMZN"
          },
          "references": [
            {
              "tags": [
                "vendor-advisory"
              ],
              "url": "https://aws.amazon.com/security/security-bulletins/2026-005-AWS/"
            },
            {
              "tags": [
                "patch"
              ],
              "url": "https://github.com/aws/aws-lc/releases/tag/v1.69.0"
            },
            {
              "tags": [
                "third-party-advisory"
              ],
              "url": "https://github.com/aws/aws-lc/security/advisories/GHSA-frmv-5gcm-jwxh"
            }
          ],
          "source": {
            "discovery": "UNKNOWN"
          },
          "title": "Timing Side-Channel in AES-CCM Tag Verification in AWS-LC",
          "x_generator": {
            "engine": "Vulnogram 0.5.0"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "ff89ba41-3aa1-4d27-914a-91399e9639e5",
        "assignerShortName": "AMZN",
        "cveId": "CVE-2026-3337",
        "datePublished": "2026-03-02T21:20:08.532Z",
        "dateReserved": "2026-02-27T15:16:28.371Z",
        "dateUpdated": "2026-03-03T20:04:27.577Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}

FKIE_CVE-2026-3337

Vulnerability from fkie_nvd - Published: 2026-03-02 22:16 - Updated: 2026-06-17 10:43

Severity

5.9 (Medium) - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N

Summary

References

URL	Tags
ff89ba41-3aa1-4d27-914a-91399e9639e5	https://aws.amazon.com/security/security-bulletins/2026-005-AWS/	Vendor Advisory
ff89ba41-3aa1-4d27-914a-91399e9639e5	https://github.com/aws/aws-lc/releases/tag/v1.69.0	Release Notes
ff89ba41-3aa1-4d27-914a-91399e9639e5	https://github.com/aws/aws-lc/security/advisories/GHSA-frmv-5gcm-jwxh	Vendor Advisory

Impacted products

Vendor	Product	Version
amazon	aws-lc-fips-sys	*
amazon	aws-lc-sys	*
amazon	aws_libcrypto	*
amazon	aws_libcrypto	*

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "AWS-LC",
          "vendor": "AWS",
          "versions": [
            {
              "lessThan": "1.69.0",
              "status": "affected",
              "version": "1.21.0",
              "versionType": "custom"
            }
          ]
        },
        {
          "defaultStatus": "unaffected",
          "product": "AWS-LC-FIPS",
          "vendor": "AWS",
          "versions": [
            {
              "lessThan": "3.2.0",
              "status": "affected",
              "version": "3.0.0",
              "versionType": "custom"
            }
          ]
        }
      ],
      "source": "ff89ba41-3aa1-4d27-914a-91399e9639e5"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:amazon:aws-lc-fips-sys:*:*:*:*:*:rust:*:*",
              "matchCriteriaId": "71BBCE97-9AF7-49FD-87CB-7E8A79C23157",
              "versionEndExcluding": "0.13.12",
              "versionStartIncluding": "0.13.0",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:amazon:aws-lc-sys:*:*:*:*:*:rust:*:*",
              "matchCriteriaId": "43114A7E-C07A-43A3-B8C8-A34D3E970371",
              "versionEndExcluding": "0.38.0",
              "versionStartIncluding": "0.14.0",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:amazon:aws_libcrypto:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "1ECDEEC4-7875-4EBE-B197-00D4F831897E",
              "versionEndExcluding": "1.69.0",
              "versionStartIncluding": "1.21.0",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:amazon:aws_libcrypto:*:*:*:*:fips:*:*:*",
              "matchCriteriaId": "0AA70D44-F3B1-41E0-9916-40B9D8C7AD9A",
              "versionEndExcluding": "3.2.0",
              "versionStartIncluding": "3.0.0",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Observable timing discrepancy in AES-CCM decryption in AWS-LC allows an unauthenticated user to potentially determine authentication tag validity via timing analysis.\n\n\n\n\nThe impacted implementations are through the EVP CIPHER API: EVP_aes_128_ccm, EVP_aes_192_ccm, and EVP_aes_256_ccm.\n\n\n\n\nCustomers of AWS services do not need to take action. Applications using AWS-LC should upgrade to AWS-LC version 1.69.0."
    },
    {
      "lang": "es",
      "value": "Una discrepancia de temporizaci\u00f3n observable en el descifrado AES-CCM en AWS-LC permite a un usuario no autenticado determinar potencialmente la validez de la etiqueta de autenticaci\u00f3n mediante an\u00e1lisis de temporizaci\u00f3n.\n\nLas implementaciones afectadas son a trav\u00e9s de la API EVP CIPHER: EVP_aes_128_ccm, EVP_aes_192_ccm y EVP_aes_256_ccm.\n\nLos clientes de los servicios de AWS no necesitan tomar ninguna medida. Las aplicaciones que utilizan AWS-LC deber\u00edan actualizar a la versi\u00f3n 1.69.0 de AWS-LC."
    }
  ],
  "id": "CVE-2026-3337",
  "lastModified": "2026-06-17T10:43:25.807",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "HIGH",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 5.9,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 2.2,
        "impactScore": 3.6,
        "source": "ff89ba41-3aa1-4d27-914a-91399e9639e5",
        "type": "Secondary"
      }
    ],
    "cvssMetricV40": [
      {
        "cvssData": {
          "Automatable": "NOT_DEFINED",
          "Recovery": "NOT_DEFINED",
          "Safety": "NOT_DEFINED",
          "attackComplexity": "HIGH",
          "attackRequirements": "PRESENT",
          "attackVector": "NETWORK",
          "availabilityRequirement": "NOT_DEFINED",
          "baseScore": 8.2,
          "baseSeverity": "HIGH",
          "confidentialityRequirement": "NOT_DEFINED",
          "exploitMaturity": "NOT_DEFINED",
          "integrityRequirement": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "privilegesRequired": "NONE",
          "providerUrgency": "NOT_DEFINED",
          "subAvailabilityImpact": "NONE",
          "subConfidentialityImpact": "NONE",
          "subIntegrityImpact": "NONE",
          "userInteraction": "NONE",
          "valueDensity": "NOT_DEFINED",
          "vectorString": "CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
          "version": "4.0",
          "vulnAvailabilityImpact": "NONE",
          "vulnConfidentialityImpact": "NONE",
          "vulnIntegrityImpact": "HIGH",
          "vulnerabilityResponseEffort": "NOT_DEFINED"
        },
        "source": "ff89ba41-3aa1-4d27-914a-91399e9639e5",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-3337",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-03-03T20:03:12.007267Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-03-02T22:16:32.093",
  "references": [
    {
      "source": "ff89ba41-3aa1-4d27-914a-91399e9639e5",
      "tags": [
        "Vendor Advisory"
      ],
      "url": "https://aws.amazon.com/security/security-bulletins/2026-005-AWS/"
    },
    {
      "source": "ff89ba41-3aa1-4d27-914a-91399e9639e5",
      "tags": [
        "Release Notes"
      ],
      "url": "https://github.com/aws/aws-lc/releases/tag/v1.69.0"
    },
    {
      "source": "ff89ba41-3aa1-4d27-914a-91399e9639e5",
      "tags": [
        "Vendor Advisory"
      ],
      "url": "https://github.com/aws/aws-lc/security/advisories/GHSA-frmv-5gcm-jwxh"
    }
  ],
  "sourceIdentifier": "ff89ba41-3aa1-4d27-914a-91399e9639e5",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-208"
        }
      ],
      "source": "ff89ba41-3aa1-4d27-914a-91399e9639e5",
      "type": "Secondary"
    }
  ]
}

RUSTSEC-2026-0043 (CVE-2026-3337)

Vulnerability from osv_rustsec – Published: 2026-03-02 12:00 – Updated: 2026-11-09 10:48 – Source website

Summary

Timing Side-Channel in AES-CCM Tag Verification in AWS-LC

Details

Observable timing discrepancy in AES-CCM decryption in AWS-LC allows an unauthenticated user to potentially determine authentication tag validity via timing analysis.

The impacted implementations are through the EVP CIPHER API: EVP_aes_128_ccm, EVP_aes_192_ccm, and EVP_aes_256_ccm.

Customers of AWS services do not need to take action. aws-lc-fips-sys contains code from AWS-LC. Applications using aws-lc-fips-sys should upgrade to the most recent release of aws-lc-fips-sys.

Workarounds

In the special cases of using AES-CCM with (M=4, L=2), (M=8, L=2), or (M=16, L=2), applications can workaround this issue by using AES-CCM through the EVP AEAD API using implementations EVP_aead_aes_128_ccm_bluetooth, EVP_aead_aes_128_ccm_bluetooth_8, and EVP_aead_aes_128_ccm_matter respectively.

Otherwise, there is no workaround and applications using aws-lc-fips-sys should upgrade to the most recent release of aws-lc-fips-sys.

Severity

5.9 (Medium)


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

References

URL

Type

	https://crates.io/crates/aws-lc-fips-sys	PACKAGE
	https://rustsec.org/advisories/RUSTSEC-2026-0043.html	ADVISORY
	https://aws.amazon.com/security/security-bulletin…	WEB

JSON

To clipboard

{
  "affected": [
    {
      "database_specific": {
        "categories": [
          "crypto-failure"
        ],
        "cvss": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N",
        "informational": null
      },
      "ecosystem_specific": {
        "affected_functions": null,
        "affects": {
          "arch": [],
          "functions": [],
          "os": []
        }
      },
      "package": {
        "ecosystem": "crates.io",
        "name": "aws-lc-fips-sys",
        "purl": "pkg:cargo/aws-lc-fips-sys"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0.13.0"
            },
            {
              "fixed": "0.13.12"
            }
          ],
          "type": "SEMVER"
        }
      ],
      "versions": []
    }
  ],
  "aliases": [
    "CVE-2026-3337",
    "GHSA-65p9-r9h6-22vj",
    "GHSA-frmv-5gcm-jwxh"
  ],
  "database_specific": {
    "license": "CC0-1.0"
  },
  "details": "Observable timing discrepancy in AES-CCM decryption in AWS-LC allows an\nunauthenticated user to potentially determine authentication tag validity\nvia timing analysis.\n\nThe impacted implementations are through the EVP CIPHER API:\n`EVP_aes_128_ccm`, `EVP_aes_192_ccm`, and `EVP_aes_256_ccm`.\n\nCustomers of AWS services do not need to take action. `aws-lc-fips-sys`\ncontains code from AWS-LC. Applications using `aws-lc-fips-sys` should\nupgrade to the most recent release of `aws-lc-fips-sys`.\n\n## Workarounds\n\nIn the special cases of using AES-CCM with (M=4, L=2), (M=8, L=2), or\n(M=16, L=2), applications can workaround this issue by using AES-CCM\nthrough the EVP AEAD API using implementations\n`EVP_aead_aes_128_ccm_bluetooth`, `EVP_aead_aes_128_ccm_bluetooth_8`,\nand `EVP_aead_aes_128_ccm_matter` respectively.\n\nOtherwise, there is no workaround and applications using `aws-lc-fips-sys`\nshould upgrade to the most recent release of `aws-lc-fips-sys`.",
  "id": "RUSTSEC-2026-0043",
  "modified": "2026-11-09T10:48:10Z",
  "published": "2026-03-02T12:00:00Z",
  "references": [
    {
      "type": "PACKAGE",
      "url": "https://crates.io/crates/aws-lc-fips-sys"
    },
    {
      "type": "ADVISORY",
      "url": "https://rustsec.org/advisories/RUSTSEC-2026-0043.html"
    },
    {
      "type": "WEB",
      "url": "https://aws.amazon.com/security/security-bulletins/2026-005-AWS"
    }
  ],
  "related": [],
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Timing Side-Channel in AES-CCM Tag Verification in AWS-LC"
}

RUSTSEC-2026-0045 (CVE-2026-3337)

Vulnerability from osv_rustsec – Published: 2026-03-02 12:00 – Updated: 2026-11-09 10:48 – Source website

Summary

Timing Side-Channel in AES-CCM Tag Verification in AWS-LC

Details

Observable timing discrepancy in AES-CCM decryption in AWS-LC allows an unauthenticated user to potentially determine authentication tag validity via timing analysis.

The impacted implementations are through the EVP CIPHER API: EVP_aes_128_ccm, EVP_aes_192_ccm, and EVP_aes_256_ccm.

Customers of AWS services do not need to take action. aws-lc-sys contains code from AWS-LC. Applications using aws-lc-sys should upgrade to the most recent release of aws-lc-sys.

Workarounds

Otherwise, there is no workaround and applications using aws-lc-sys should upgrade to the most recent release.

Severity

5.9 (Medium)


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

References

URL

Type

	https://crates.io/crates/aws-lc-sys	PACKAGE
	https://rustsec.org/advisories/RUSTSEC-2026-0045.html	ADVISORY
	https://aws.amazon.com/security/security-bulletin…	WEB

JSON

To clipboard

{
  "affected": [
    {
      "database_specific": {
        "categories": [
          "crypto-failure"
        ],
        "cvss": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N",
        "informational": null
      },
      "ecosystem_specific": {
        "affected_functions": null,
        "affects": {
          "arch": [],
          "functions": [],
          "os": []
        }
      },
      "package": {
        "ecosystem": "crates.io",
        "name": "aws-lc-sys",
        "purl": "pkg:cargo/aws-lc-sys"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0.14.0"
            },
            {
              "fixed": "0.38.0"
            }
          ],
          "type": "SEMVER"
        }
      ],
      "versions": []
    }
  ],
  "aliases": [
    "CVE-2026-3337",
    "GHSA-65p9-r9h6-22vj",
    "GHSA-frmv-5gcm-jwxh"
  ],
  "database_specific": {
    "license": "CC0-1.0"
  },
  "details": "Observable timing discrepancy in AES-CCM decryption in AWS-LC allows an\nunauthenticated user to potentially determine authentication tag validity\nvia timing analysis.\n\nThe impacted implementations are through the EVP CIPHER API:\n`EVP_aes_128_ccm`, `EVP_aes_192_ccm`, and `EVP_aes_256_ccm`.\n\nCustomers of AWS services do not need to take action. `aws-lc-sys` contains\ncode from AWS-LC. Applications using `aws-lc-sys` should upgrade to the most\nrecent release of `aws-lc-sys`.\n\n## Workarounds\n\nIn the special cases of using AES-CCM with (M=4, L=2), (M=8, L=2), or\n(M=16, L=2), applications can workaround this issue by using AES-CCM through\nthe EVP AEAD API using implementations `EVP_aead_aes_128_ccm_bluetooth`,\n`EVP_aead_aes_128_ccm_bluetooth_8`, and `EVP_aead_aes_128_ccm_matter`\nrespectively.\n\nOtherwise, there is no workaround and applications using `aws-lc-sys` should\nupgrade to the most recent release.",
  "id": "RUSTSEC-2026-0045",
  "modified": "2026-11-09T10:48:10Z",
  "published": "2026-03-02T12:00:00Z",
  "references": [
    {
      "type": "PACKAGE",
      "url": "https://crates.io/crates/aws-lc-sys"
    },
    {
      "type": "ADVISORY",
      "url": "https://rustsec.org/advisories/RUSTSEC-2026-0045.html"
    },
    {
      "type": "WEB",
      "url": "https://aws.amazon.com/security/security-bulletins/2026-005-AWS"
    }
  ],
  "related": [],
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Timing Side-Channel in AES-CCM Tag Verification in AWS-LC"
}

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.

Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

Order JSON

How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

Publication & reservation Sightings KEV catalogs Other timestamps

Loading timeline…

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.

Action not permitted

CVE-2026-3337 (GCVE-0-2026-3337)

FKIE_CVE-2026-3337

RUSTSEC-2026-0043 (CVE-2026-3337)

Workarounds

RUSTSEC-2026-0045 (CVE-2026-3337)

Workarounds

Tags

Sightings

Nomenclature

Vulnerability timeline

Related by attack behaviour