CVE-2020-25686

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Source
https://cve.org/CVERecord?id=CVE-2020-25686
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2020-25686.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2020-25686
Downstream
Related
Published
2021-01-20T17:15:13Z
Modified
2026-03-14T14:45:42.083931Z
Severity
  • 3.7 (Low) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N CVSS Calculator
Summary
[none]
Details

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.

References

Affected packages

Git /

Affected ranges

Database specific

unresolved_ranges 
[
    {
        "events": [
            {
                "introduced": "0"
            },
            {
                "fixed": "2.83"
            }
        ]
    },
    {
        "events": [
            {
                "introduced": "0"
            },
            {
                "last_affected": "32"
            }
        ]
    },
    {
        "events": [
            {
                "introduced": "0"
            },
            {
                "last_affected": "33"
            }
        ]
    },
    {
        "events": [
            {
                "introduced": "0"
            },
            {
                "last_affected": "10.0"
            }
        ]
    },
    {
        "events": [
            {
                "introduced": "4.21"
            },
            {
                "fixed": "4.21.14m"
            }
        ]
    },
    {
        "events": [
            {
                "introduced": "4.22"
            },
            {
                "fixed": "4.22.9m"
            }
        ]
    },
    {
        "events": [
            {
                "introduced": "4.23"
            },
            {
                "fixed": "4.23.7m"
            }
        ]
    },
    {
        "events": [
            {
                "introduced": "4.24"
            },
            {
                "fixed": "4.24.5m"
            }
        ]
    },
    {
        "events": [
            {
                "introduced": "4.25"
            },
            {
                "fixed": "4.25.2f"
            }
        ]
    },
    {
        "events": [
            {
                "introduced": "0"
            },
            {
                "fixed": "2.83"
            }
        ]
    }
]
source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2020-25686.json"