What is CVE-2018-0147?

CVE-2018-0147 is a critical-severity vulnerability in Cisco Secure Access Control System, classified under Improper Input Validation. CVSS score: 9.8/10. Published 2018-03-08.

How severe is CVE-2018-0147?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Is CVE-2018-0147 known to be exploited?

Yes. CVE-2018-0147 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2022-03-25), indicating it is being actively exploited. 3 public proof-of-concept repositories are indexed.

Deserialization in Cisco Secure Access Control System

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.

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

Published 2018-03-08 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.182 (97.2th percentile), scored 2026-10-19.

Moderate probability of exploitation in the next 30 days — watch for active exploitation reports. 97th percentile — 97.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.182 · newest: 0.182 · change: 0.000

Affected products

Cisco Secure Access Control System — versions 5.2\(0.3\), 5.2(0.3)
Cisco Secure Access Control System — versions Cisco Secure Access Control System

Weakness classification (CWE)

CISA KEV (Known Exploited Vulnerabilities)

This CVE is on the CISA KEV catalog, added on 2022-03-25. CISA KEV inclusion means CISA has confirmed in-the-wild exploitation; US federal agencies are required to remediate within a published due date.

BOD 22-01 due date: 2022-04-15.

Required action: Apply updates per vendor instructions.

Public proof-of-concept exploits

References

www.securitytracker.com/id/1040463 (VDB Entry, Third Party Advisory, vdb-entry)
www.securityfocus.com/bid/103328 (VDB Entry, Third Party Advisory, vdb-entry, Broken Link)
tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180307… (Vendor Advisory)
134c704f-9b21-4f2e-91b3-4a467353bcc0 (US Government Resource)

Frequently asked questions

What is CVE-2018-0147?: CVE-2018-0147 is a critical-severity vulnerability in Cisco Secure Access Control System, classified under Improper Input Validation. CVSS score: 9.8/10. Published 2018-03-08.
How severe is CVE-2018-0147?: Critical severity. CVSS v3 base score is 9.8 out of 10.
Is CVE-2018-0147 known to be exploited?: Yes. CVE-2018-0147 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2022-03-25), indicating it is being actively exploited. 3 public proof-of-concept repositories are indexed.