CVE-2020-25682

highPriorität · beachten · 58EPSS 0.751 · 100. PerzentilDEEURUUS
grimoire priorityP1 · Urgent
Exploitable?
—
no known exploitation
Likely / severe?
75.1% (100th) EPSS
CVSS 8.3 · high
Is it mine?
55 products
Prüfe deine Angriffsfläche
Who says so?
5 sources
cnnvd · enisa_euvd · fstec_bdu · cert_bund

EPSS · bewertet 2026-10-27

A flaw was found in dnsmasq before 2.83. A buffer overflow vulnerability was discovered in the way dnsmasq extract names from DNS packets before validating them with DNSSEC data. An attacker on the network, who can create valid DNS replies, could use this flaw to cause an overflow with arbitrary data in a heap-allocated memory, possibly executing code on the machine. The flaw is in the rfc1035.c:extract_name() function, which writes data to the memory pointed by name assuming MAXDNAME*2 bytes are available in the buffer. However, in some code execution paths, it is possible extract_name() gets passed an offset from the base buffer, thus reducing, in practice, the number of available bytes that can be written in the buffer. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.

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Behebungen

Hersteller-Fix, Mitigation oder Workaround, wie von den Quellen veröffentlicht.

Ein Hersteller-Fix ist verfügbar.

02

cvss

Technischer Schweregrad, 0–10. Eine Zeile je Quelle.

8.3
010

Basiswert 0–10 · höher = schwerwiegender · Vektor überfahren zum Auflösen

v2.08.3highAV:N/AC:M/Au:N/C:P/I:P/A:Cprimary · NVD / NIST USAusnutzbarkeit 8.6 · Auswirkung 8.5
v3.18.1highCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:Hprimary · NVD / NIST USAusnutzbarkeit 2.2 · Auswirkung 5.9
v3.18.1highAV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:Hsecondary · FSTEC (BDU) RU
v3.18.1highCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H/E:Hsecondary · CVSS-BT (t0sche)
v3.18.1highCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:Hsecondary · Cisco PSIRT US
03

schwächen

Die CWE-Schwächeklassen, zu denen dies gehört.

CWE-122USCWE-122USCWE-787USCWE-787US
04

betroffene Produkte (55)

Betroffene Produkte und Versionsbereiche.

20 von 55 angezeigt
05

Advisories (2)

Hersteller- und Ökosystem-Meldungen dazu.

  • WID-SEC-W-2023-2836dnsmasq: Mehrere SchwachstellenDeutsch2021-01-18csaf · cert_bundDE

    Ein entfernter, anonymer Angreifer kann mehrere Schwachstellen in dnsmasq und mehreren Cisco Produkten ausnutzen, um beliebigen Programmcode auszuführen und um den DNS Cache zu manipulieren.

  • cisco-sa-dnsmasq-dns-2021-c5mrdf3gMultiple Vulnerabilities in dnsmasq DNS Forwarder Affecting Cisco Products: January 20212021-01-19csaf · cisco_csafUS

    A set of previously unknown vulnerabilities in the DNS forwarder implementation of dnsmasq were disclosed on January 19, 2021. The vulnerabilities are collectively known as DNSpooq. Exploitation of these vulnerabilities could result in remote code execution or denial of service (DoS), or may allow an attacker to more easily forge DNS answers that can poison DNS caches, depending on the specific vulnerability. Multiple Cisco products are affected by these vulnerabilities. Cisco will release software updates that address these vulnerabilities. Any workarounds for a specific Cisco product or service will be documented in the relevant Cisco bugs, which are identified in the Vulnerable Products ["#vp"] section of this advisory. Note: At the time of publication, no Cisco products were found to be affected by the remote code execution and DoS vulnerabilities, which are identified by the following Common Vulnerabilities and Exposures (CVE) IDs: CVE-2020-25681 CVE-2020-25682 CVE-2020-25683 CVE-2020-25687

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auch bekannt als (4)

Weitere Namen und Kennungen dieser Entität.

07

quellen

Welche Quellen diesen Datensatz belegen und wann.

cnnvdenisa_euvdfstec_bducert_bundcisco_csafNVDCVE.orgMITRE
veröffentlicht 2021-01-20geändert 2026-06-17
08

Referenzen (39)

Externe Belege — Patches, Meldungen, Analysen.

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