How severe is CVE-2009-5153?

CVE-2009-5153 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2009-5153 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 6% (93rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2009-5153?

CVE-2009-5153 primarily affects Microfocus Netware. In total, 8 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2009-5153?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2009-5153 published?

CVE-2009-5153 was published on 2018-11-21 and last updated on 2026-06-16.

CVE-2009-5153

CVE-2009-5153 is a critical-severity vulnerability in Microfocus Netware with a CVSS 3.x base score of 9.8. 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: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 6% (93rd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-119
Affected product: Microfocus Netware
Published: 2018-11-21
Last modified: 2026-06-16

Description

In Novell NetWare before 6.5 SP8, a stack buffer overflow in processing of CALLIT RPC calls in the NFS Portmapper daemon in PKERNEL.NLM allowed remote unauthenticated attackers to execute code, because a length field was incorrectly trusted.

Frequently asked questions

What is CVE-2009-5153?: In Novell NetWare before 6.5 SP8, a stack buffer overflow in processing of CALLIT RPC calls in the NFS Portmapper daemon in PKERNEL.NLM allowed remote unauthenticated attackers to execute code, because a length field was incorrectly trusted.
How severe is CVE-2009-5153?: CVE-2009-5153 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2009-5153 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 6% (93rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2009-5153?: CVE-2009-5153 primarily affects Microfocus Netware. In total, 8 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2009-5153?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2009-5153 published?: CVE-2009-5153 was published on 2018-11-21 and last updated on 2026-06-16.

References

Affected products (8)

cpe:2.3:a:microfocus:netware:*:*:*:*:*:*:*:*
cpe:2.3:a:microfocus:netware:6.5:sp1:*:*:*:*:*:*
cpe:2.3:a:microfocus:netware:6.5:sp2:*:*:*:*:*:*
cpe:2.3:a:microfocus:netware:6.5:sp3:*:*:*:*:*:*
cpe:2.3:a:microfocus:netware:6.5:sp4:*:*:*:*:*:*
cpe:2.3:a:microfocus:netware:6.5:sp5:*:*:*:*:*:*
cpe:2.3:a:microfocus:netware:6.5:sp6:*:*:*:*:*:*
cpe:2.3:a:microfocus:netware:6.5:sp7:*:*:*:*:*:*

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