CVE-2020-25687

Katalog CVE

CVSS 5.9 · Medium EPSS 86,7%

Kerentanan Heap-based Buffer Overflow pada thekelleys dnsmasq, fedoraproject fedora +1 lainnya. Skor CVSS 3.1 5.9 (Medium) menurut NVD.

Deskripsi (NVD)

A flaw was found in dnsmasq before version 2.83. A heap-based buffer overflow was discovered in dnsmasq when DNSSEC is enabled and before it validates the received DNS entries. This flaw allows a remote attacker, who can create valid DNS replies, to cause an overflow in a heap-allocated memory. This flaw is caused by the lack of length checks in rfc1035.c:extract_name(), which could be abused to make the code execute memcpy() with a negative size in sort_rrset() and cause a crash in dnsmasq, resulting in a denial of service. The highest threat from this vulnerability is to system availability.

Rincian

Terbit di NVD

20 Januari 2021

Terakhir diubah

17 Juni 2026

Status NVD

Modified

CVSS 3.1

5.9 (Medium), sumber NVD
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H · uraikan di kalkulator

Jenis kelemahan (CWE)

CWE-122: Heap-based Buffer Overflow

EPSS (30 hari)

86,7% peluang dieksploitasi; lebih tinggi dari 99,7% CVE lain

Produk dan versi terdampak

> Data dari konfigurasi CPE di NVD.

Referensi dan perbaikan

• https://bugzilla.redhat.com/show_bug.cgi?id=1891568 issue tracking · patch · advisory pihak ketiga
• https://lists.debian.org/debian-lts-announce/2021/03/msg00027.html mailing list · advisory pihak ketiga
• https://security.gentoo.org/glsa/202101-17 advisory pihak ketiga
• https://www.debian.org/security/2021/dsa-4844 advisory pihak ketiga
• https://www.jsof-tech.com/disclosures/dnspooq/ advisory pihak ketiga
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QGB7HL3OWHTLE...
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WYW3IR6APUSKO...
• https://www.kb.cert.org/vuls/id/434904