How severe is CVE-2019-20918?

CVE-2019-20918 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2019-20918 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (71st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2019-20918?

CVE-2019-20918 affects Inspircd. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2019-20918?

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

When was CVE-2019-20918 published?

CVE-2019-20918 was published on 2020-09-11 and last updated on 2026-06-17.

CVE-2019-20918

CVE-2019-20918 is a medium-severity vulnerability in Inspircd with a CVSS 3.x base score of 6.5. 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: Medium (CVSS 3.x base score 6.5)
CVSS v2: 6.8
EPSS exploit prediction: 1% (71st percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-416
Affected product: Inspircd
Published: 2020-09-11
Last modified: 2026-06-17

Description

An issue was discovered in InspIRCd 3 before 3.1.0. The silence module contains a use after free vulnerability. This vulnerability can be used for remote crashing of an InspIRCd server by any user able to fully connect to a server.

Frequently asked questions

What is CVE-2019-20918?: An issue was discovered in InspIRCd 3 before 3.1.0. The silence module contains a use after free vulnerability. This vulnerability can be used for remote crashing of an InspIRCd server by any user able to fully connect to a server.
How severe is CVE-2019-20918?: CVE-2019-20918 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2019-20918 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (71st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2019-20918?: CVE-2019-20918 affects Inspircd. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2019-20918?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2019-20918 published?: CVE-2019-20918 was published on 2020-09-11 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:inspircd:inspircd:*:*:*:*:*:*:*:*

More vulnerabilities in Inspircd

CVE-2012-6696 — Critical (CVSS 9.8): inspircd in Debian before 2.0.7 does not properly handle unsigned integers. NOTE: This vulnerability exists because of…
CVE-2015-6674 — Critical (CVSS 9.8): Buffer underflow vulnerability in the Debian inspircd package before 2.0.5-1+deb7u1 for wheezy and before 2.0.16-1 for…
CVE-2015-8702 — High (CVSS 8.6): The DNS::GetResult function in dns.cpp in InspIRCd before 2.0.19 allows remote DNS servers to cause a denial of service…
CVE-2012-1836 — High (CVSS 7.5): Heap-based buffer overflow in dns.cpp in InspIRCd 2.0.5 might allow remote attackers to execute arbitrary code via a…
CVE-2020-25269 — Medium (CVSS 6.5): An issue was discovered in InspIRCd 2 before 2.0.29 and 3 before 3.6.0. The pgsql module contains a use after free…
CVE-2019-20917 — Medium (CVSS 6.5): An issue was discovered in InspIRCd 2 before 2.0.28 and 3 before 3.3.0. The mysql module contains a NULL pointer…

All CVEs affecting Inspircd →

Other CWE-416 (Use After Free) vulnerabilities

CVE-2026-13782 — Critical (CVSS 10.0): Use after free in Browser in Google Chrome prior to 150.0.7871.47 allowed a remote attacker who had compromised the…
CVE-2026-4725 — Critical (CVSS 10.0): Sandbox escape due to use-after-free in the Graphics: Canvas2D component. This vulnerability was fixed in Firefox 149…
CVE-2026-4688 — Critical (CVSS 10.0): Sandbox escape due to use-after-free in the Disability Access APIs component. This vulnerability was fixed in Firefox…
CVE-2025-24085 — Critical (CVSS 10.0): A use after free issue was addressed with improved memory management. This issue is fixed in iOS 18.3 and iPadOS 18.3,…
CVE-2024-43102 — Critical (CVSS 10.0): Concurrent removals of certain anonymous shared memory mappings by using the UMTX_SHM_DESTROY sub-request of…
CVE-2021-32495 — Critical (CVSS 10.0): Radare2 has a use-after-free vulnerability in pyc parser's get_none_object function. Attacker can read freed memory…

Browse all CWE-416 (Use After Free) vulnerabilities →