Skip to content
Fencer Intel
high 7.5

CVE-2015-5621 in the critical feed json

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 ite…

published 11y ago modified 4mo ago also EUVD-2015-5573

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
38.3%
EPSS 38.3% chance of exploitation in 30 days, percentile 98%
public exploits
1
Exploit-DB

Summary

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.

Patch / fix

  • net-snmp Debian 14, Debian 13, Debian 12 5.7.3+dfsg-1.1

debian advisories DEBIAN-CVE-2015-5621

  • net-snmp Ubuntu 14.04 LTS 5.7.2~dfsg-8.1ubuntu3.1

ubuntu advisories UBUNTU-CVE-2015-5621

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

  • net-snmp RHEL 6 1:5.5-54.el6_7.1
  • net-snmp RHEL 7 1:5.7.2-20.el7_1.1
  • net-snmp RHEL 7 1:5.7.2-20.ael7b_1.1
  • net-snmp-gui RHEL 7 1:5.7.2-20.el7_1.1
  • net-snmp-gui RHEL 7 1:5.7.2-20.ael7b_1.1
  • net-snmp-libs RHEL 6 1:5.5-54.el6_7.1
  • net-snmp-libs RHEL 7 1:5.7.2-20.el7_1.1
  • net-snmp-libs RHEL 7 1:5.7.2-20.ael7b_1.1

red hat advisories RHSA-2015:1636

  • net-snmp SLES for SAP 12, SLES 12, SLED 12 +1 more 5.7.2.1-4.3.2
  • net-snmp SLES for SAP 11 SP4, SLES for SAP 11 SP3, SLES 11 SP4 +6 more 5.4.2.1-8.12.24.1

suse advisories SUSE-SU-2015:1556-1SUSE-SU-2015:1524-1

  • net-snmp openSUSE Tumbleweed 5.7.3-8.4

opensuse advisories openSUSE-SU-2024:10204-1

  • net-snmp Arch Linux 5.8-1

arch linux advisories AVG-777

Is CVE-2015-5621 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

Check with Fencer

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-2015-5621 updated cvss 5.1

net-snmp: snmp_pdu_parse() incompletely parsed varBinds left in list of variables

  • Red Hat Enterprise Linux Client (v. 7) net-snmp 5.7.2-20.el7_1.1, net-snmp-libs 5.7.2-20.el7_1.1, net-snmp-utils 5.7.2-20.el7_1.1, net-snmp-agent-libs 5.7.2-20.el7_1.1 Red Hat Enterprise Linux Client Optional (v. 7) net-snmp-gui 5.7.2-20.el7_1.1, net-snmp-perl 5.7.2-20.el7_1.1, net-snmp-python 5.7.2-20.el7_1.1, net-snmp-sysvinit 5.7.2-20.el7_1.1 Red Hat Enterprise Linux ComputeNode (v. 7) net-snmp 5.7.2-20.el7_1.1, net-snmp-libs 5.7.2-20.el7_1.1, net-snmp-utils 5.7.2-20.el7_1.1, net-snmp-agent-libs 5.7.2-20.el7_1.1 Red Hat Enterprise Linux ComputeNode Optional (v. 7) net-snmp-gui 5.7.2-20.el7_1.1, net-snmp-perl 5.7.2-20.el7_1.1, net-snmp-python 5.7.2-20.el7_1.1, net-snmp-sysvinit 5.7.2-20.el7_1.1 Red Hat Enterprise Linux Desktop (v. 6) net-snmp 5.5-54.el6_7.1, net-snmp-libs 5.5-54.el6_7.1 Red Hat Enterprise Linux Desktop Optional (v. 6) net-snmp-perl 5.5-54.el6_7.1, net-snmp-utils 5.5-54.el6_7.1, net-snmp-python 5.5-54.el6_7.1
    +8 more products
    Red Hat Enterprise Linux HPC Node (v. 6) net-snmp 5.5-54.el6_7.1, net-snmp-libs 5.5-54.el6_7.1, net-snmp-perl 5.5-54.el6_7.1, net-snmp-utils 5.5-54.el6_7.1, net-snmp-python 5.5-54.el6_7.1 Red Hat Enterprise Linux HPC Node Optional (v. 6) net-snmp-devel 5.5-54.el6_7.1, net-snmp-debuginfo 5.5-54.el6_7.1 Red Hat Enterprise Linux Server (v. 6) net-snmp 5.5-54.el6_7.1, net-snmp-libs 5.5-54.el6_7.1, net-snmp-perl 5.5-54.el6_7.1, net-snmp-utils 5.5-54.el6_7.1, net-snmp-python 5.5-54.el6_7.1 Red Hat Enterprise Linux Server (v. 7) net-snmp 5.7.2-20.el7_1.1, net-snmp 5.7.2-20.ael7b_1.1, net-snmp-libs 5.7.2-20.el7_1.1, net-snmp-utils 5.7.2-20.el7_1.1, net-snmp-libs 5.7.2-20.ael7b_1.1, net-snmp-utils 5.7.2-20.ael7b_1.1, +2 more Red Hat Enterprise Linux Server Optional (v. 7) net-snmp-gui 5.7.2-20.el7_1.1, net-snmp-perl 5.7.2-20.el7_1.1, net-snmp-gui 5.7.2-20.ael7b_1.1, net-snmp-perl 5.7.2-20.ael7b_1.1, net-snmp-python 5.7.2-20.el7_1.1, net-snmp-python 5.7.2-20.ael7b_1.1, +2 more Red Hat Enterprise Linux Workstation (v. 6) net-snmp 5.5-54.el6_7.1, net-snmp-libs 5.5-54.el6_7.1, net-snmp-perl 5.5-54.el6_7.1, net-snmp-utils 5.5-54.el6_7.1, net-snmp-python 5.5-54.el6_7.1 Red Hat Enterprise Linux Workstation (v. 7) net-snmp 5.7.2-20.el7_1.1, net-snmp-libs 5.7.2-20.el7_1.1, net-snmp-utils 5.7.2-20.el7_1.1, net-snmp-agent-libs 5.7.2-20.el7_1.1 Red Hat Enterprise Linux Workstation Optional (v. 7) net-snmp-gui 5.7.2-20.el7_1.1, net-snmp-perl 5.7.2-20.el7_1.1, net-snmp-python 5.7.2-20.el7_1.1, net-snmp-sysvinit 5.7.2-20.el7_1.1
    fixed: vendor fix RHSA-2015:1636

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 ICSA-26-111-10 updated cvss 7.5

Silex Technology SD-330AC and AMC Manager

  • Silex Technology AMC Manager <=5.0.2 Silex Technology SD-330AC <=1.42
    affected: vendor fix, mitigation “CVE-2015-5621: Disable SNMP service.” silex.jp

From CISA ICS and IT advisories (CSAF, https://github.com/cisagov/CSAF), a U.S. Government work; changed: reduced to products, statuses and remediations. CISA notification · csaf

cisa ICSA-20-042-02 updated cvss 7.5

Siemens Industrial Products SNMP (Update F)

  • Siemens IE/PB link PN IO (6GK1411-5AB10) <V4.0.1
    affected: fixed in V4.0.1, mitigation support.industry.siemens.com
  • Siemens SCALANCE S602 <V4.1 Siemens SCALANCE S612 <V4.1 Siemens SCALANCE S623 <V4.1 Siemens SCALANCE S627-2M <V4.1
    affected: fixed in V4.1, mitigation
  • Siemens SIMATIC CP 343-1 Advanced (6GK7343-1GX31-0XE0)
    affected: mitigation, no fix planned
  • Siemens SIMATIC CP 443-1 (6GK7443-1EX30-0XE0) <V3.3 Siemens SIMATIC CP 443-1 (6GK7443-1EX30-0XE1) <V3.3 Siemens SIMATIC CP 443-1 Advanced (6GK7443-1GX30-0XE0) <V3.3
    affected: fixed in V3.3, mitigation support.industry.siemens.com
  • Siemens SIMATIC CP 443-1 OPC UA (6GK7443-1UX00-0XE0)
    affected: mitigation, no fix planned
  • Siemens SIMATIC CP 1623 (6GK1162-3AA00) <V14.00.15.00_51.25.00.01
    affected: vendor fix, mitigation support.industry.siemens.com
  • Siemens SIMATIC CP 1626 (6GK1162-6AA01) <V1.1.1
    affected: fixed in V1.1.1, mitigation support.industry.siemens.com
  • Siemens SIMATIC CP 1628 (6GK1162-8AA00) <V14.00.15.00_51.25.00.01
    affected: vendor fix, mitigation support.industry.siemens.com
show 4 more
  • Siemens SIPLUS NET CP 343-1 Advanced (6AG1343-1GX31-4XE0)
    affected: mitigation, no fix planned
  • Siemens SIPLUS NET CP 443-1 (6AG1443-1EX30-4XE0) <V3.3 Siemens SIPLUS NET CP 443-1 Advanced (6AG1443-1GX30-4XE0) <V3.3
    affected: fixed in V3.3, mitigation support.industry.siemens.com
  • Siemens SIPLUS NET IE/PB link PN IO (6AG1411-5AB10-2AA0) <V4.0.1
    affected: fixed in V4.0.1, mitigation support.industry.siemens.com
  • Siemens SIPLUS TIM 1531 IRC (6AG1543-1MX00-7XE0) <V2.0 Siemens TIM 1531 IRC (6GK7543-1MX00-0XE0) <V2.0
    affected: fixed in V2.0, mitigation support.industry.siemens.com

Facts from CISA's republication of the vendor's own advisory (CSAF); the linked advisory is the authoritative source. CISA notification · csaf

Timeline

  1. Published
  2. First public exploit (EDB-45547)

CISA SSVC

Exploitation
Proof of concept is public
Automatable
yes
Technical impact
partial
Assessed
11mo ago

Exploit prediction

38.32% chance of exploitation in the next 30 days, higher than 98% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

  • EDB-45547 net-snmp 5.7.3 - (Authenticated) Denial of Service (PoC) dos, 2018-10-08
  • openwall.com http://www.openwall.com/lists/oss-security/2015/04/13/1 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CISA ADP 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 2.0 7.5 AV:N/AC:L/Au:N/C:P/I:P/A:P

Classification

Weakness
  • CWE-190 Integer Overflow or Wraparound
  • CWE-19 Data Processing Errors

References

Sources

Fencer Intel 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.