CVE-2015-5621

Exp

The snmp_pdu_parse function in snmp_api.c in net-snmp 5.7.2 and earlier does not remove the varBind variable in a netsnmp_variable_list item when parsing of the SNMP PDU fails, which allows remote attackers to cause a denial of service (crash) and possibly execute arbitrary code via a crafted packet.

Published: 2015-08-19 Last update: 2026-05-06 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2015-5621 is rated High Exploit Risk (82.1/100): CVSS High severity, with high exploitation likelihood (EPSS 17.70%, 95th percentile). 2 public exploit reference(s) are indexed (Exploit-DB). EPSS rose +3.77% over the last day, indicating growing attacker interest. Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

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

Public exploit references (Exploit-DB) for CVE-2015-5621

EDB-ID Source Kind Published Link
45547 exploit_db edb 2018-10-08 Exploit-DB ↗
— nvd_ref exploit_tag Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2015-5621

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 2026-05-04 13.93% 17.70% +3.77%
2 2026-04-21 17.81% 13.93% -3.88%
3 2026-03-04 — 17.81% —

Full EPSS history (37 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2015-5621

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.5 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 3.6 134c704f-9b21-4f2e-91b3-4a467353bcc0
7.5 2.0 HIGH
AV:N/AC:L/Au:N/C:P/I:P/A:P 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:P)
Partial confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:P)
Partial availability impact.
 10.0 6.4 [email protected]

Weakness enumeration for CVE-2015-5621

OS Trackers for CVE-2015-5621

vendor priority summary link
debian not yet assigned CVE-2015-5621 not yet assigned priority: Debian including 1 source packages (net-snmp), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2015-5621
redhat medium — https://access.redhat.com/security/cve/CVE-2015-5621
suse high CVE-2015-5621 severity important: SUSE including 337 source package names (amazon/suse-sles-15-sp1-chost-byos-v20210304-hvm-ssd-x86_64, amazon/suse-sles-15-sp1-chost-byos-v20220127-hvm-ssd-x86_64, …), 530 product×package rows across 67 product lines (HPE Helion OpenStack 8, SUSE Liberty Linux 7, … (67 product lines)): Known Affected 231, Fixed 224, Known Not Affected 75. https://www.suse.com/security/cve/CVE-2015-5621/
ubuntu medium CVE-2015-5621 medium priority: Ubuntu including 1 source packages (net-snmp), 4 status rows across 4 suites (precise, trusty, upstream, vivid): released 3, needed 1. https://ubuntu.com/security/CVE-2015-5621

Affected software / configurations for CVE-2015-5621

Vendor Product Version Raw CPE
net-snmp net-snmp <= 5.7.2 cpe:2.3:a:net-snmp:net-snmp:*:*:*:*:*:*:*:*

References for CVE-2015-5621

cvelogic Threat Intelligence