How severe is CVE-2018-1000857?

CVE-2018-1000857 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2018-1000857 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (87th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2018-1000857?

CVE-2018-1000857 affects Open-systems Log-user-session. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2018-1000857?

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-2018-1000857 published?

CVE-2018-1000857 was published on 2018-12-20 and last updated on 2026-06-17.

CVE-2018-1000857

CVE-2018-1000857 is a high-severity vulnerability in Open-systems Log-user-session with a CVSS 3.x base score of 8.8. 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-22.

Key facts

Severity: High (CVSS 3.x base score 8.8)
CVSS v2: 9.0
EPSS exploit prediction: 3% (87th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-22
Affected product: Open-systems Log-user-session
Published: 2018-12-20
Last modified: 2026-06-17

Description

log-user-session version 0.7 and earlier contains a Directory Traversal vulnerability in Main SUID-binary /usr/local/bin/log-user-session that can result in User to root privilege escalation. This attack appear to be exploitable via Malicious unprivileged user executes the vulnerable binary/(remote) environment variable manipulation similar shell-shock also possible.

Frequently asked questions

What is CVE-2018-1000857?: log-user-session version 0.7 and earlier contains a Directory Traversal vulnerability in Main SUID-binary /usr/local/bin/log-user-session that can result in User to root privilege escalation. This attack appear to be exploitable via Malicious unprivileged user executes the vulnerable binary/(remote) environment variable manipulation similar shell-shock also possible.
How severe is CVE-2018-1000857?: CVE-2018-1000857 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2018-1000857 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (87th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2018-1000857?: CVE-2018-1000857 affects Open-systems Log-user-session. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2018-1000857?: 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-2018-1000857 published?: CVE-2018-1000857 was published on 2018-12-20 and last updated on 2026-06-17.

References

https://www.halfdog.net/Security/2018/LogUserSessionLocalRootPrivilegeEscalation/

Affected products (1)

cpe:2.3:a:open-systems:log-user-session:*:*:*:*:*:*:*:*

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