How severe is CVE-2001-1056?

CVE-2001-1056 has a CVSS 2.0 base score of 7.5, rated high severity.

Is CVE-2001-1056 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (82nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2001-1056?

CVE-2001-1056 affects Linux Linux Kernel. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2001-1056?

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

When was CVE-2001-1056 published?

CVE-2001-1056 was published on 2001-07-30 and last updated on 2026-06-16.

CVE-2001-1056

CVE-2001-1056 is a high-severity vulnerability in Linux Linux Kernel with a CVSS 2.0 base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: High (CVSS 2.0 base score 7.5)
EPSS exploit prediction: 2% (82nd percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Linux Linux Kernel
Published: 2001-07-30
Last modified: 2026-06-16

Description

IRC DCC helper in the ip_masq_irc IP masquerading module 2.2 allows remote attackers to bypass intended firewall restrictions by causing the target system to send a "DCC SEND" request to a malicious server which listens on port 6667, which may cause the module to believe that the traffic is a valid request and allow the connection to the port specified in the DCC SEND request.

Frequently asked questions

What is CVE-2001-1056?: IRC DCC helper in the ip_masq_irc IP masquerading module 2.2 allows remote attackers to bypass intended firewall restrictions by causing the target system to send a "DCC SEND" request to a malicious server which listens on port 6667, which may cause the module to believe that the traffic is a valid request and allow the connection to the port specified in the DCC SEND request.
How severe is CVE-2001-1056?: CVE-2001-1056 has a CVSS 2.0 base score of 7.5, rated high severity.
Is CVE-2001-1056 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (82nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2001-1056?: CVE-2001-1056 affects Linux Linux Kernel. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2001-1056?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2001-1056 published?: CVE-2001-1056 was published on 2001-07-30 and last updated on 2026-06-16.

References

Affected products (1)

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

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