CVE-2021-41991 (GCVE-0-2021-41991)

Vulnerability from cvelistv5 – Published: 2021-10-18 13:44 – Updated: 2024-08-04 03:22
VLAI
Summary
The in-memory certificate cache in strongSwan before 5.9.4 has a remote integer overflow upon receiving many requests with different certificates to fill the cache and later trigger the replacement of cache entries. The code attempts to select a less-often-used cache entry by means of a random number generator, but this is not done correctly. Remote code execution might be a slight possibility.
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE
  • n/a
Assigner
References
Show details on NVD website
To clipboard 

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      "descriptions": "[{\"lang\": \"en\", \"value\": \"The in-memory certificate cache in strongSwan before 5.9.4 has a remote integer overflow upon receiving many requests with different certificates to fill the cache and later trigger the replacement of cache entries. The code attempts to select a less-often-used cache entry by means of a random number generator, but this is not done correctly. Remote code execution might be a slight possibility.\"}, {\"lang\": \"es\", \"value\": \"La cach\\u00e9 de certificados en memoria en strongSwan versiones anteriores a 5.9.4, presenta un desbordamiento de enteros remoto al recibir muchas peticiones con diferentes certificados para llenar la cach\\u00e9 y posteriormente desencadenar la sustituci\\u00f3n de las entradas de la cach\\u00e9. El c\\u00f3digo intenta seleccionar una entrada de cach\\u00e9 menos usada mediante un generador de n\\u00fameros aleatorios, pero esto no es realizado correctamente. Una ejecuci\\u00f3n de c\\u00f3digo remota  podr\\u00eda ser una peque\\u00f1a posibilidad\"}]",
      "id": "CVE-2021-41991",
      "lastModified": "2024-11-21T06:27:02.090",
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      "published": "2021-10-18T14:15:10.333",
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      "sourceIdentifier": "cve@mitre.org",
      "vulnStatus": "Modified",
      "weaknesses": "[{\"source\": \"nvd@nist.gov\", \"type\": \"Primary\", \"description\": [{\"lang\": \"en\", \"value\": \"CWE-190\"}]}]"
    },
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-06-26T17:54:52+00:00",
      "cve": "CVE-2021-41991",
      "id": "CVE-2021-41991",
      "initial_release_date": "2021-10-18T00:00:00+00:00",
      "product_status:known_affected": "1",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "strongswan: integer overflow when replacing certificates in cache",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-41991.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "important",
      "current_release_date": "2026-07-19T18:15:02Z",
      "cve": "CVE-2021-41991",
      "id": "CVE-2021-41991",
      "initial_release_date": "2023-02-15T03:37:21Z",
      "product_status:known_affected": "1",
      "product_status:recommended": "415",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2021-41991",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2021-41991.json",
      "version": "16"
    }
  }
}



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Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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.