How severe is CVE-2009-4501?

CVE-2009-4501 has a CVSS 2.0 base score of 5.0, rated medium severity.

Is CVE-2009-4501 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 9% (94th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2009-4501?

CVE-2009-4501 primarily affects Zabbix. In total, 10 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2009-4501?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2009-4501 published?

CVE-2009-4501 was published on 2009-12-31 and last updated on 2026-06-16.

CVE-2009-4501

CVE-2009-4501 is a medium-severity vulnerability in Zabbix with a CVSS 2.0 base score of 5.0. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-119.

Key facts

Severity: Medium (CVSS 2.0 base score 5.0)
EPSS exploit prediction: 9% (94th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-119
Affected product: Zabbix
Published: 2009-12-31
Last modified: 2026-06-16

Description

The zbx_get_next_field function in libs/zbxcommon/str.c in Zabbix Server before 1.6.8 allows remote attackers to cause a denial of service (crash) via a request that lacks expected separators, which triggers a NULL pointer dereference, as demonstrated using the Command keyword.

Frequently asked questions

What is CVE-2009-4501?: The zbx_get_next_field function in libs/zbxcommon/str.c in Zabbix Server before 1.6.8 allows remote attackers to cause a denial of service (crash) via a request that lacks expected separators, which triggers a NULL pointer dereference, as demonstrated using the Command keyword.
How severe is CVE-2009-4501?: CVE-2009-4501 has a CVSS 2.0 base score of 5.0, rated medium severity.
Is CVE-2009-4501 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 9% (94th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2009-4501?: CVE-2009-4501 primarily affects Zabbix. In total, 10 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2009-4501?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2009-4501 published?: CVE-2009-4501 was published on 2009-12-31 and last updated on 2026-06-16.

References

Affected products (10)

cpe:2.3:a:zabbix:zabbix:*:*:*:*:*:*:*:*
cpe:2.3:a:zabbix:zabbix:1.1.2:*:*:*:*:*:*:*
cpe:2.3:a:zabbix:zabbix:1.1.3:*:*:*:*:*:*:*
cpe:2.3:a:zabbix:zabbix:1.1.4:*:*:*:*:*:*:*
cpe:2.3:a:zabbix:zabbix:1.1.5:*:*:*:*:*:*:*
cpe:2.3:a:zabbix:zabbix:1.4.2:*:*:*:*:*:*:*
cpe:2.3:a:zabbix:zabbix:1.4.3:*:*:*:*:*:*:*
cpe:2.3:a:zabbix:zabbix:1.4.4:*:*:*:*:*:*:*
cpe:2.3:a:zabbix:zabbix:1.4.6:*:*:*:*:*:*:*
cpe:2.3:a:zabbix:zabbix:1.6.6:*:*:*:*:*:*:*

More vulnerabilities in Zabbix

CVE-2007-0640 — Critical (CVSS 10.0): Buffer overflow in ZABBIX before 1.1.5 has unknown impact and attack vectors related to "SNMP IP addresses."
CVE-2024-42327 — Critical (CVSS 9.9): A non-admin user account on the Zabbix frontend with the default User role, or with any other role that gives API…
CVE-2024-22116 — Critical (CVSS 9.9): An administrator with restricted permissions can exploit the script execution functionality within the Monitoring Hosts…
CVE-2020-11800 — Critical (CVSS 9.8): Zabbix Server 2.2.x and 3.0.x before 3.0.31, and 3.2 allows remote attackers to execute arbitrary code.
CVE-2013-3738 — Critical (CVSS 9.8): A File Inclusion vulnerability exists in Zabbix 2.0.6 due to inadequate sanitization of request strings in CGI scripts,…
CVE-2013-5743 — Critical (CVSS 9.8): Multiple SQL injection vulnerabilities in Zabbix 1.8.x before 1.8.18rc1, 2.0.x before 2.0.9rc1, and 2.1.x before 2.1.7.

All CVEs affecting Zabbix →

Other CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer) vulnerabilities

CVE-2026-2778 — Critical (CVSS 10.0): Sandbox escape due to incorrect boundary conditions in the DOM: Core & HTML component. This vulnerability was fixed in…
CVE-2026-2776 — Critical (CVSS 10.0): Sandbox escape due to incorrect boundary conditions in the Telemetry component in External Software. This vulnerability…
CVE-2025-1866 — Critical (CVSS 10.0): Improper Restriction of Operations within the Bounds of a Memory Buffer vulnerability in warmcat libwebsockets allows…
CVE-2022-27625 — Critical (CVSS 10.0): A vulnerability regarding improper restriction of operations within the bounds of a memory buffer is found in the…
CVE-2022-27624 — Critical (CVSS 10.0): A vulnerability regarding improper restriction of operations within the bounds of a memory buffer is found in the…
CVE-2020-11896 — Critical (CVSS 10.0): The Treck TCP/IP stack before 6.0.1.66 allows Remote Code Execution, related to IPv4 tunneling.

Browse all CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer) vulnerabilities →