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Fencer Vulns
high 7.8

CVE-2020-15861 json

Net-SNMP through 5.7.3 allows Escalation of Privileges because of UNIX symbolic link (symlink) following.

published 2020-08-19 6 y ago modified 2026-06-17 4 mo ago also EUVD-2020-7842

cvss
7.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.5%
EPSS 0.5% chance of exploitation in 30 days, percentile 39%
public exploits
0
none known

Summary

Net-SNMP through 5.7.3 allows Escalation of Privileges because of UNIX symbolic link (symlink) following.

Patch / fix

  • net-snmp Debian 14, Debian 13, Debian 12 5.8+dfsg-5

debian advisories DEBIAN-CVE-2020-15861

  • net-snmp Ubuntu 16.04 LTS 5.7.3+dfsg-1ubuntu4.5
  • net-snmp Ubuntu 18.04 LTS 5.7.3+dfsg-1.8ubuntu3.5
  • net-snmp Ubuntu 20.04 LTS 5.8+dfsg-2ubuntu2.3
  • net-snmp Ubuntu Pro 14.04 LTS 5.7.2~dfsg-8.1ubuntu3.3+esm1

ubuntu advisories UBUNTU-CVE-2020-15861

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices 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-2020-15861 updated cvss 8.0

net-snmp: combination with can lead to elevated permissions to root

  • Red Hat Enterprise Linux 5 net-snmp Red Hat Enterprise Linux 6 net-snmp, net-snmp-libs, net-snmp-perl, net-snmp-utils, net-snmp-python Red Hat Enterprise Linux 7 net-snmp, net-snmp-gui, net-snmp-libs, net-snmp-perl, net-snmp-utils, net-snmp-python, +2 more Red Hat Enterprise Linux 8 net-snmp, net-snmp-libs, net-snmp-perl, net-snmp-utils, net-snmp-agent-libs
    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

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
total
Assessed
11 mo ago

Exploit prediction

0.46% chance of exploitation in the next 30 days, higher than 39% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CISA ADP 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
NVD 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CNA 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 7.2 AV:L/AC:L/Au:N/C:C/I:C/A:C

Classification

Weakness
  • CWE-59 Improper Link Resolution Before File Access

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.