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CVE-2021-3541 (GCVE-0-2021-3541)

Vulnerability from cvelistv5 – Published: 2021-07-09 16:02 – Updated: 2024-08-03 17:01
VLAI
Summary
A flaw was found in libxml2. Exponential entity expansion attack its possible bypassing all existing protection mechanisms and leading to denial of service.
Severity
6.5 (Medium)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE
  • Denial of Service
Assigner
References
Impacted products
Vendor Product Version CPE status
n/a libxml2 Affected: 2.9.11
Show details on NVD website
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-06-28T07:47:21+00:00",
      "cve": "CVE-2021-3541",
      "id": "CVE-2021-3541",
      "initial_release_date": "2021-05-13T00:00:00+00:00",
      "product_status:fixed": "193",
      "product_status:known_affected": "12",
      "product_status:known_not_affected": "4",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "libxml2: Exponential entity expansion attack bypasses all existing protection mechanisms",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-3541.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-01T01:41:16Z",
      "cve": "CVE-2021-3541",
      "id": "CVE-2021-3541",
      "initial_release_date": "2023-02-15T03:49:12Z",
      "product_status:known_affected": "289",
      "product_status:known_not_affected": "51",
      "product_status:recommended": "675",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2021-3541",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2021-3541.json",
      "version": "59"
    }
  }
}



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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.


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.