How severe is CVE-2018-0147?

CVE-2018-0147 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2018-0147 being actively exploited?

Yes. CVE-2018-0147 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2022-03-25, which means active exploitation has been confirmed. It should be prioritised for remediation.

What products are affected by CVE-2018-0147?

CVE-2018-0147 affects Cisco Secure Access Control System. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2018-0147?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Because this CVE is known to be actively exploited, treat remediation as urgent — CISA KEV typically sets a short remediation deadline.

Does CVE-2018-0147 have an EU (EUVD) identifier?

Yes. CVE-2018-0147 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2018-0970. It is also flagged as exploited in the EUVD (since 2022-03-25).

When was CVE-2018-0147 published?

CVE-2018-0147 was published on 2018-03-08 and last updated on 2026-06-17.

CVE-2018-0147

CVE-2018-0147 is a critical-severity vulnerability in Cisco Secure Access Control System with a CVSS 3.x base score of 9.8. It is listed in CISA's Known Exploited Vulnerabilities (KEV) catalog, confirming it has been exploited in the wild (added 2022-03-25). The underlying weakness is classified as CWE-502.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 10.0
EPSS exploit prediction: 19% (97th percentile)
Actively exploited: Yes — listed in CISA KEV (added 2022-03-25)
EU (EUVD) id: EUVD-2018-0970
EU exploitation: Flagged exploited in the ENISA EU Vulnerability Database (since 2022-03-25)
Weakness: CWE-502
Affected product: Cisco Secure Access Control System
Published: 2018-03-08
Last modified: 2026-06-17

Description

A vulnerability in Java deserialization used by Cisco Secure Access Control System (ACS) prior to release 5.8 patch 9 could allow an unauthenticated, remote attacker to execute arbitrary commands on an affected device. The vulnerability is due to insecure deserialization of user-supplied content by the affected software. An attacker could exploit this vulnerability by sending a crafted serialized Java object. An exploit could allow the attacker to execute arbitrary commands on the device with root privileges. Cisco Bug IDs: CSCvh25988.

Frequently asked questions

What is CVE-2018-0147?: A vulnerability in Java deserialization used by Cisco Secure Access Control System (ACS) prior to release 5.8 patch 9 could allow an unauthenticated, remote attacker to execute arbitrary commands on an affected device. The vulnerability is due to insecure deserialization of user-supplied content by the affected software. An attacker could exploit this vulnerability by sending a crafted serialized Java object. An exploit could allow the attacker to execute arbitrary commands on the device with root privileges. Cisco Bug IDs: CSCvh25988.
How severe is CVE-2018-0147?: CVE-2018-0147 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2018-0147 being actively exploited?: Yes. CVE-2018-0147 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2022-03-25, which means active exploitation has been confirmed. It should be prioritised for remediation.
What products are affected by CVE-2018-0147?: CVE-2018-0147 affects Cisco Secure Access Control System. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2018-0147?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Because this CVE is known to be actively exploited, treat remediation as urgent — CISA KEV typically sets a short remediation deadline.
Does CVE-2018-0147 have an EU (EUVD) identifier?: Yes. CVE-2018-0147 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2018-0970. It is also flagged as exploited in the EUVD (since 2022-03-25).
When was CVE-2018-0147 published?: CVE-2018-0147 was published on 2018-03-08 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:cisco:secure_access_control_system:5.2\(0.3\):*:*:*:*:*:*:*

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