Vulnerability-Lookup

GHSA-CFCF-X7X2-GPF8

Vulnerability from github – Published: 2021-12-17 00:00 – Updated: 2025-11-03 21:30

Details

An issue was discovered in Suricata before 6.0.4. It is possible to bypass/evade any HTTP-based signature by faking an RST TCP packet with random TCP options of the md5header from the client side. After the three-way handshake, it's possible to inject an RST ACK with a random TCP md5header option. Then, the client can send an HTTP GET request with a forbidden URL. The server will ignore the RST ACK and send the response HTTP packet for the client's request. These packets will not trigger a Suricata reject action.

Severity

7.5 (High)


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

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{
  "affected": [],
  "aliases": [
    "CVE-2021-45098"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2021-12-16T05:15:00Z",
    "severity": "HIGH"
  },
  "details": "An issue was discovered in Suricata before 6.0.4. It is possible to bypass/evade any HTTP-based signature by faking an RST TCP packet with random TCP options of the md5header from the client side. After the three-way handshake, it\u0027s possible to inject an RST ACK with a random TCP md5header option. Then, the client can send an HTTP GET request with a forbidden URL. The server will ignore the RST ACK and send the response HTTP packet for the client\u0027s request. These packets will not trigger a Suricata reject action.",
  "id": "GHSA-cfcf-x7x2-gpf8",
  "modified": "2025-11-03T21:30:36Z",
  "published": "2021-12-17T00:00:32Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-45098"
    },
    {
      "type": "WEB",
      "url": "https://github.com/OISF/suricata/commit/50e2b973eeec7172991bf8f544ab06fb782b97df"
    },
    {
      "type": "WEB",
      "url": "https://forum.suricata.io/t/suricata-6-0-4-and-5-0-8-released/1942"
    },
    {
      "type": "WEB",
      "url": "https://github.com/OISF/suricata/releases"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2025/03/msg00029.html"
    },
    {
      "type": "WEB",
      "url": "https://redmine.openinfosecfoundation.org/issues/4710"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2021-45098 (GCVE-0-2021-45098)

Vulnerability from cvelistv5 – Published: 2021-12-16 04:07 – Updated: 2025-11-03 19:26

Summary

Severity

No CVSS data available.

CWE

Assigner

mitre mitre root

References

5 references

URL	Tags
https://github.com/OISF/suricata/releases	x_refsource_MISC
https://redmine.openinfosecfoundation.org/issues/4710	x_refsource_MISC
https://forum.suricata.io/t/suricata-6-0-4-and-5-…	x_refsource_MISC
https://github.com/OISF/suricata/commit/50e2b973e…	x_refsource_MISC
https://lists.debian.org/debian-lts-announce/2025…

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          },
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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.

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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.

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GHSA-CFCF-X7X2-GPF8

CVE-2021-45098 (GCVE-0-2021-45098)

Tags

Sightings

Nomenclature

Related by attack behaviour