How severe is CVE-2017-13649?

CVE-2017-13649 has a CVSS 3.x base score of 5.5, rated medium severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2017-13649 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (20th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2017-13649?

CVE-2017-13649 affects Unrealircd. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2017-13649?

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

When was CVE-2017-13649 published?

CVE-2017-13649 was published on 2017-08-23 and last updated on 2026-06-17.

CVE-2017-13649

CVE-2017-13649 is a medium-severity vulnerability in Unrealircd with a CVSS 3.x base score of 5.5. 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-665.

Key facts

Severity: Medium (CVSS 3.x base score 5.5)
CVSS v2: 2.1
EPSS exploit prediction: 0% (20th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-665
Affected product: Unrealircd
Published: 2017-08-23
Last modified: 2026-06-17

Description

UnrealIRCd 4.0.13 and earlier creates a PID file after dropping privileges to a non-root account, which might allow local users to kill arbitrary processes by leveraging access to this non-root account for PID file modification before a root script executes a "kill `cat /pathname`" command. NOTE: the vendor indicates that there is no common or recommended scenario in which a root script would execute this kill command.

Frequently asked questions

What is CVE-2017-13649?: UnrealIRCd 4.0.13 and earlier creates a PID file after dropping privileges to a non-root account, which might allow local users to kill arbitrary processes by leveraging access to this non-root account for PID file modification before a root script executes a "kill `cat /pathname`" command. NOTE: the vendor indicates that there is no common or recommended scenario in which a root script would execute this kill command.
How severe is CVE-2017-13649?: CVE-2017-13649 has a CVSS 3.x base score of 5.5, rated medium severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2017-13649 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (20th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2017-13649?: CVE-2017-13649 affects Unrealircd. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2017-13649?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2017-13649 published?: CVE-2017-13649 was published on 2017-08-23 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-2023-50784 — High (CVSS 7.5): A buffer overflow in websockets in UnrealIRCd 6.1.0 through 6.1.3 before 6.1.4 allows an unauthenticated 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-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-665 (Improper Initialization) vulnerabilities

CVE-2021-33635 — Critical (CVSS 9.8): When malicious images are pulled by isula pull, attackers can execute arbitrary code.
CVE-2022-37128 — Critical (CVSS 9.8): In D-Link DIR-816 A2_v1.10CNB04.img the network can be initialized without authentication via /goform/wizard_end.
CVE-2021-41264 — Critical (CVSS 9.8): OpenZeppelin Contracts is a library for smart contract development. In affected versions upgradeable contracts using…
CVE-2019-10196 — Critical (CVSS 9.8): A flaw was found in http-proxy-agent, prior to version 2.1.0. It was discovered http-proxy-agent passes an auth option…
CVE-2015-8367 — Critical (CVSS 9.8): The phase_one_correct function in Libraw before 0.17.1 allows attackers to cause memory errors and possibly execute…
CVE-2019-14271 — Critical (CVSS 9.8): In Docker 19.03.x before 19.03.1 linked against the GNU C Library (aka glibc), code injection can occur when the…

Browse all CWE-665 (Improper Initialization) vulnerabilities →