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CVE-2020-25686 (GCVE-0-2020-25686)

Vulnerability from cvelistv5 – Published: 2021-01-20 16:47 – Updated: 2025-11-04 19:12
VLAI
Summary
A flaw was found in dnsmasq before version 2.83. When receiving a query, dnsmasq does not check for an existing pending request for the same name and forwards a new request. By default, a maximum of 150 pending queries can be sent to upstream servers, so there can be at most 150 queries for the same name. This flaw allows an off-path attacker on the network to substantially reduce the number of attempts that it would have to perform to forge a reply and have it accepted by dnsmasq. This issue is mentioned in the "Birthday Attacks" section of RFC5452. If chained with CVE-2020-25684, the attack complexity of a successful attack is reduced. The highest threat from this vulnerability is to data integrity.
Severity
3.7 (Low)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
CWE
Assigner
References
Impacted products
Vendor Product Version CPE status
n/a dnsmasq Affected: dnsmasq 2.83
Show details on NVD website
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-06-28T12:01:43+00:00",
      "cve": "CVE-2020-25686",
      "id": "CVE-2020-25686",
      "initial_release_date": "2020-01-01T00:00:00+00:00",
      "product_status:fixed": "180",
      "product_status:known_affected": "4",
      "product_status:known_not_affected": "107",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "dnsmasq: multiple queries forwarded for the same name makes forging replies easier for an off-path attacker",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2020/cve-2020-25686.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "important",
      "current_release_date": "2026-09-03T00:51:12Z",
      "cve": "CVE-2020-25686",
      "id": "CVE-2020-25686",
      "initial_release_date": "2023-02-15T03:53:38Z",
      "product_status:recommended": "113",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2020-25686",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2020-25686.json",
      "version": "23"
    }
  }
}



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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.


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.