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Fencer Vulns
high 8.8

CVE-2020-10030 in the critical feed json

An issue has been found in PowerDNS Recursor 4.1.0 up to and including 4.3.0.

published 2020-05-19 6 y ago modified 2026-06-17 4 mo ago also EUVD-2020-2495

cvss
8.8
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
24.5%
EPSS 24.5% chance of exploitation in 30 days, percentile 97%
public exploits
0
none known

Summary

An issue has been found in PowerDNS Recursor 4.1.0 up to and including 4.3.0. It allows an attacker (with enough privileges to change the system's hostname) to cause disclosure of uninitialized memory content via a stack-based out-of-bounds read. It only occurs on systems where gethostname() does not have '\0' termination of the returned string if the hostname is larger than the supplied buffer. (Linux systems are not affected because the buffer is always large enough. OpenBSD systems are not affected because the returned hostname always has '\0' termination.) Under some conditions, this issue can lead to the writing of one '\0' byte out-of-bounds on the stack, causing a denial of service or possibly arbitrary code execution.

Patch / fix

  • pdns-recursor Debian 14, Debian 13, Debian 12 4.3.1-1

debian advisories DEBIAN-CVE-2020-10030

  • pdns-recursor openSUSE Tumbleweed 4.5.5-1.3
  • pdns-recursor Package Hub 15 SP1, Package Hub 12 SP1, openSUSE Leap 15.1 4.1.12-bp151.4.3.1

opensuse advisories openSUSE-SU-2024:11157-1openSUSE-SU-2020:0698-1

  • pdns-recursor Alpine 3.10, Alpine 3.9 4.1.16-r0

alpine advisories ALPINE-CVE-2020-10030

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2020-10030 updated cvss 7.5

pdns-recursor: stack-based out-of-bounds read via a larger hostname

  • Red Hat All currently supported Red Hat products
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

24.50% chance of exploitation in the next 30 days, higher than 97% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 8.8 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 6.5 AV:N/AC:L/Au:S/C:P/I:P/A:P

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.