How severe is CVE-2011-4040?

CVE-2011-4040 has a CVSS 2.0 base score of 10.0, rated critical severity.

Is CVE-2011-4040 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 65% (99th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2011-4040?

CVE-2011-4040 affects Njstar Njstar Communicator. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2011-4040?

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-2011-4040 published?

CVE-2011-4040 was published on 2011-11-21 and last updated on 2026-06-16.

CVE-2011-4040

CVE-2011-4040 is a critical-severity vulnerability in Njstar Njstar Communicator with a CVSS 2.0 base score of 10.0. Its EPSS exploit-prediction score of 65% places it in the 99th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-119.

Key facts

Severity: Critical (CVSS 2.0 base score 10.0)
EPSS exploit prediction: 65% (99th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-119
Affected product: Njstar Njstar Communicator
Published: 2011-11-21
Last modified: 2026-06-16

Description

Buffer overflow in MiniSmtp 3.0.11818 in NJStar Communicator allows remote attackers to execute arbitrary code via a crafted packet.

Frequently asked questions

What is CVE-2011-4040?: Buffer overflow in MiniSmtp 3.0.11818 in NJStar Communicator allows remote attackers to execute arbitrary code via a crafted packet.
How severe is CVE-2011-4040?: CVE-2011-4040 has a CVSS 2.0 base score of 10.0, rated critical severity.
Is CVE-2011-4040 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 65% (99th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2011-4040?: CVE-2011-4040 affects Njstar Njstar Communicator. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2011-4040?: 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-2011-4040 published?: CVE-2011-4040 was published on 2011-11-21 and last updated on 2026-06-16.

References

http://www.kb.cert.org/vuls/id/819630

Affected products (1)

cpe:2.3:a:njstar:njstar_communicator:3.0.11818:*:*:*:*:*:*:*

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