How severe is CVE-2017-15227?

CVE-2017-15227 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2017-15227 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (79th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2017-15227?

CVE-2017-15227 affects Irssi. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2017-15227?

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-2017-15227 published?

CVE-2017-15227 was published on 2017-10-22 and last updated on 2026-06-17.

CVE-2017-15227

CVE-2017-15227 is a high-severity vulnerability in Irssi with a CVSS 3.x base score of 7.5. 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-416.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 2% (79th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-416
Affected product: Irssi
Published: 2017-10-22
Last modified: 2026-06-17

Description

Irssi before 1.0.5, while waiting for the channel synchronisation, may incorrectly fail to remove destroyed channels from the query list, resulting in use-after-free conditions when updating the state later on.

Frequently asked questions

What is CVE-2017-15227?: Irssi before 1.0.5, while waiting for the channel synchronisation, may incorrectly fail to remove destroyed channels from the query list, resulting in use-after-free conditions when updating the state later on.
How severe is CVE-2017-15227?: CVE-2017-15227 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2017-15227 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (79th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2017-15227?: CVE-2017-15227 affects Irssi. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2017-15227?: 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-2017-15227 published?: CVE-2017-15227 was published on 2017-10-22 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:irssi:irssi:*:*:*:*:*:*:*:*

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