Description
SNMPv3 HMAC verification in (1) Net-SNMP 5.2.x before 5.2.4.1, 5.3.x before 5.3.2.1, and 5.4.x before 5.4.1.1; (2) UCD-SNMP; (3) eCos; (4) Juniper Session and Resource Control (SRC) C-series 1.0.0 through 2.0.0; (5) NetApp (aka Network Appliance) Data ONTAP 7.3RC1 and 7.3RC2; (6) SNMP Research before 16.2; (7) multiple Cisco IOS, CatOS, ACE, and Nexus products; (8) Ingate Firewall 3.1.0 and later and SIParator 3.1.0 and later; (9) HP OpenView SNMP Emanate Master Agent 15.x; and possibly other products relies on the client to specify the HMAC length, which makes it easier for remote attackers to bypass SNMP authentication via a length value of 1, which only checks the first byte.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | net-snmp | 5.4.1~dfsg-8.1 | — |
| Debian 13 | net-snmp | 5.4.1~dfsg-8.1 | — |
| Debian 12 | net-snmp | 5.4.1~dfsg-8.1 | — |
| Debian 5.0 | net-snmp | 5.4.1~dfsg-7.1+lenny1 | DTSA-137-1 |
| Debian 4.0 | net-snmp | 5.2.3-7etch4 | DSA-1663-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 5 | net-snmp +4 | 1:5.3.1-24.el5_2.1 | RHSA-2008:0529 |
| RHEL 4 | net-snmp +4 | 5.1.2-11.el4_6.11.3 | RHSA-2008:0529 |
| RHEL 3 | net-snmp +4 | 5.0.9-2.30E.24 | RHSA-2008:0529 |
| RHEL 2 | ucd-snmp +2 | 4.2.5-8.AS21.7 | RHSA-2008:0528 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 4.5 EUS | net-snmp +4 | 5.1.2-11.el4_6.11.3 | RHSA-2008:0529 |
Public exploits
Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.
Exploit-DB 1
- SNMPv3 - HMAC Validation error Remote Authentication Bypass EDB-5790 · remote · Jun 12, 2008 · verified
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
Advisories 4
- RHSA-2008:0529 Red Hat Security Advisory: net-snmp security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- RHSA-2008:0528 Red Hat Security Advisory: ucd-snmp security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- DSA-1663-1 net-snmp - several vulnerabilities Debian Security (DSA / DLA) · Mar 9, 2026
- DTSA-137-1 net-snmp - authentication bypass Debian Security (DSA / DLA) · Mar 9, 2026
References
- http://sourceforge.net/tracker/index.php?func=detail&aid=1989089&group_id=12694&atid=456380
- 35463 third-party-advisory
- 30615 third-party-advisory
- http://support.apple.com/kb/HT2163
- ADV-2008-1787 vdb-entry
- 30648 third-party-advisory
- http://www.kb.cert.org/vuls/id/CTAR-7FBS8Q
- 32664 third-party-advisory
- ADV-2008-1981 vdb-entry
- ADV-2008-1801 vdb-entry
- SUSE-SA:2008:039 vendor-advisory
- [productinfo] 20080611 Ingate Firewall and SIParator affected by SNMPv3 vulnerability mailing-list
- 31351 third-party-advisory
- ADV-2008-1788 vdb-entry
- http://support.avaya.com/elmodocs2/security/ASA-2008-282.htm
- FEDORA-2008-5215 vendor-advisory
- 29623 vdb-entry
- 31334 third-party-advisory
- ADV-2008-2971 vdb-entry
- oval:org.mitre.oval:def:10820 vdb-entry signature
- oval:org.mitre.oval:def:6414 vdb-entry signature
- 30626 third-party-advisory
- SSRT080082 vendor-advisory
- http://www.vmware.com/security/advisories/VMSA-2008-0017.html
- [oss-security] 20080609 [oCERT-2008-006] multiple SNMP implementations HMAC authentication spoofing mailing-list
- VU#878044 third-party-advisory
- 30647 third-party-advisory
- 238865 vendor-advisory
- 20081031 VMSA-2008-0017 Updated ESX packages for libxml2, ucd-snmp, libtiff mailing-list
- ADV-2008-1836 vdb-entry
- 33003 third-party-advisory
- 20080610 SNMP Version 3 Authentication Vulnerabilities vendor-advisory
- ADV-2008-2361 vdb-entry
- 31568 third-party-advisory
- 31467 third-party-advisory
- APPLE-SA-2008-06-30 vendor-advisory
- DSA-1663 vendor-advisory
- TA08-162A third-party-advisory
- http://www.kb.cert.org/vuls/id/MIMG-7ETS87
- http://www.ocert.org/advisories/ocert-2008-006.html
- RHSA-2008:0528 vendor-advisory
- 3933 third-party-advisory
- RHSA-2008:0529 vendor-advisory
- 30612 third-party-advisory
- 30802 third-party-advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=447974
- http://www.vmware.com/security/advisories/VMSA-2008-0013.html
- http://www.kb.cert.org/vuls/id/MIMG-7ETS5Z
- 5790 exploit
- ADV-2008-1797 vdb-entry
- GLSA-200808-02 vendor-advisory
- 20080609 [oCERT-2008-006] multiple SNMP implementations HMAC authentication spoofing mailing-list
- 30665 third-party-advisory
- FEDORA-2008-5218 vendor-advisory
- FEDORA-2008-5224 vendor-advisory
- ADV-2008-1800 vdb-entry
- MDVSA-2008:118 vendor-advisory
- USN-685-1 vendor-advisory
- http://sourceforge.net/forum/forum.php?forum_id=833770
- 1020218 vdb-entry