How severe is CVE-2023-50784?

CVE-2023-50784 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-2023-50784 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (77th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-50784?

CVE-2023-50784 affects Unrealircd. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2023-50784?

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-2023-50784 published?

CVE-2023-50784 was published on 2023-12-16 and last updated on 2026-06-17.

CVE-2023-50784

CVE-2023-50784 is a high-severity vulnerability in Unrealircd 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-120.

Key facts

Severity: High (CVSS 3.x base score 7.5)
EPSS exploit prediction: 2% (77th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-120
Affected product: Unrealircd
Published: 2023-12-16
Last modified: 2026-06-17

Description

A buffer overflow in websockets in UnrealIRCd 6.1.0 through 6.1.3 before 6.1.4 allows an unauthenticated remote attacker to crash the server by sending an oversized packet (if a websocket port is open). Remote code execution might be possible on some uncommon, older platforms.

Frequently asked questions

What is CVE-2023-50784?: A buffer overflow in websockets in UnrealIRCd 6.1.0 through 6.1.3 before 6.1.4 allows an unauthenticated remote attacker to crash the server by sending an oversized packet (if a websocket port is open). Remote code execution might be possible on some uncommon, older platforms.
How severe is CVE-2023-50784?: CVE-2023-50784 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-2023-50784 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (77th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-50784?: CVE-2023-50784 affects Unrealircd. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2023-50784?: 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-2023-50784 published?: CVE-2023-50784 was published on 2023-12-16 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:unrealircd:unrealircd:*:*:*:*:*:*:*:*

More vulnerabilities in Unrealircd

CVE-2016-7144 — High (CVSS 8.1): The m_authenticate function in modules/m_sasl.c in UnrealIRCd before 3.2.10.7 and 4.x before 4.0.6 allows remote…
CVE-2010-2075 — High (CVSS 7.5): UnrealIRCd 3.2.8.1, as distributed on certain mirror sites from November 2009 through June 2010, contains an externally…
CVE-2009-4893 — Medium (CVSS 6.8): Buffer overflow in UnrealIRCd 3.2beta11 through 3.2.8, when allow::options::noident is enabled, allows remote attackers…
CVE-2017-13649 — Medium (CVSS 5.5): UnrealIRCd 4.0.13 and earlier creates a PID file after dropping privileges to a non-root account, which might allow…
CVE-2013-7384 — Medium (CVSS 5.0): UnrealIRCd 3.2.10 before 3.2.10.2 allows remote attackers to cause a denial of service (NULL pointer dereference and…
CVE-2013-6413 — Medium (CVSS 5.0): Use-after-free vulnerability in UnrealIRCd 3.2.10 before 3.2.10.2 allows remote attackers to cause a denial of service…

All CVEs affecting Unrealircd →

Other CWE-120 (Classic Buffer Overflow) vulnerabilities

CVE-2025-48611 — Critical (CVSS 10.0): In DeviceId of DeviceId.java, there is a possible desync in persistence due to a missing bounds check. This could lead…
CVE-2026-24823 — Critical (CVSS 10.0): Out-of-bounds Write, Buffer Copy without Checking Size of Input ('Classic Buffer Overflow') vulnerability in FASTSHIFT…
CVE-2026-24810 — Critical (CVSS 10.0): Buffer Copy without Checking Size of Input ('Classic Buffer Overflow') vulnerability in rethinkdb (src/cjson modules).…
CVE-2026-24800 — Critical (CVSS 10.0): Out-of-bounds Write, Buffer Copy without Checking Size of Input ('Classic Buffer Overflow') vulnerability in tildearrow…
CVE-2025-9962 — Critical (CVSS 10.0): A buffer overflow vulnerability in Novakon P series allows attackers to gain root permission without prior…
CVE-2010-10016 — Critical (CVSS 10.0): BS.Player version 2.57 (build 1051) contains a vulnerability in its playlist import functionality. When processing .m3u…

Browse all CWE-120 (Classic Buffer Overflow) vulnerabilities →