Is CVE-2015-5621 actively exploited?

A proof-of-concept exploit is publicly available for CVE-2015-5621, but active exploitation has not been confirmed.

Can CVE-2015-5621 be exploited remotely?

Yes. CVE-2015-5621 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2015-5621?

CVE-2015-5621 has a CVSS score of 7.5 (HIGH).

HOME VULNERABILITIESCVE-2015-5621

HIGHPOC

CVE-2015-5621

CWE-19Published: August 19, 2015· Updated: Jun 17, 2026

7.5

CVSS v3.1

Official Description

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.

NVD Source

Technical Analysis

CVE-2015-5621 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 7.5.

A proof-of-concept (PoC) exploit exists for CVE-2015-5621. While not yet confirmed in active campaigns, the availability of PoC code increases exploitation risk substantially.

CVSS v3.1 Vector Breakdown

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges Req.None

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected Vendors & Products

net-snmp1 product(s)

net-snmp

Source: NVD CPE · 1 total CPE entries

Exploit & PoC Resources

POC AVAILABLEProof-of-concept code exists

Exploit-DB

Offensive Security exploit database

GitHub PoC Search

Community PoC repositories

Rapid7 / Metasploit

Metasploit module search

PacketStorm

Security advisories & exploits

External links open in a new tab. Always verify in a controlled environment before use.

News & Research Mentioning CVE-2015-5621

Silex Technology SD-330AC and AMC Manager

CISA Alerts· Apr 21, 2026

View CSAF Summary Successful exploitation of these vulnerabilities could allow an attacker to execute arbitrary code, cause a denial-of-service, or configuration information may be altered without authentication. The following versions of Silex Technology SD-330AC and AMC Manager are affected: SD-330AC <=1.42 (CVE-2026-32955, CVE-2026-32956, CVE-2026-32957, CVE-2026-32958, CVE-2015-5621, CVE-2026-32959, CVE-2026-32960, CVE-2026-32961, CVE-2026-32962, CVE-2024-24487, CVE-2026-32963, CVE-2026-32964, CVE-2026-32965) AMC Manager <=5.0.2 (CVE-2026-32955, CVE-2026-32956, CVE-2026-32957, CVE-2026-32958, CVE-2015-5621, CVE-2026-32959, CVE-2026-32960, CVE-2026-32961, CVE-2026-32962, CVE-2024-24487, CVE-2026-32963, CVE-2026-32964, CVE-2026-32965) CVSS Vendor E [xlite_meta score:69 src:CISA Alerts xlite_fp:59008822000cc265cfbef4a5ceb2ad1508e5d38b9789d70505eaaa38dd228d03]