CVE-2017-16820

The csnmp_read_table function in snmp.c in the SNMP plugin in collectd before 5.6.3 is susceptible to a double free in a certain error case, which could lead to a crash (or potentially have other impact).

Published: 2017-11-14 Last update: 2026-05-13 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2017-16820 is rated High Risk (71.1/100): CVSS Critical severity, with medium exploitation likelihood (EPSS 4.00%). High exploitation likelihood—assess exposure and prioritize remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2017-16820

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 3.34% 4.00% +0.65%
2 2026-06-04 3.42% 3.34% -0.08%
3 2026-04-08 — 3.42% —

Full EPSS history (14 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2017-16820

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
9.8 3.0 CRITICAL
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 5.9 [email protected]
10.0 2.0 HIGH
AV:N/AC:L/Au:N/C:C/I:C/A:C Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:C)
Complete confidentiality impact.
Integrity impact (I:C)
Complete integrity impact.
Availability impact (A:C)
Complete availability impact.
 10.0 10.0 [email protected]

Weakness enumeration for CVE-2017-16820

OS Trackers for CVE-2017-16820

vendor priority summary link
debian not yet assigned CVE-2017-16820 not yet assigned priority: Debian including 1 source packages (collectd), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2017-16820
gentoo high CVE-2017-16820: 1 GLSA(s) (201803-10), 1 atom(s) (app-admin/collectd); latest impact high. https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2017-16820
redhat medium — https://access.redhat.com/security/cve/CVE-2017-16820
ubuntu medium CVE-2017-16820 medium priority: Ubuntu including 1 source packages (collectd), 13 status rows across 13 suites (artful, bionic, cosmic, disco, eoan, focal, groovy, hirsute, impish, trusty, upstream, xenial, zesty): not-affected 8, released 3, ignored 2. https://ubuntu.com/security/CVE-2017-16820

Affected software / configurations for CVE-2017-16820

Vendor Product Version Raw CPE
collectd collectd < 5.6.3 cpe:2.3:a:collectd:collectd:*:*:*:*:*:*:*:*

References for CVE-2017-16820

cvelogic Threat Intelligence