How severe is CVE-2018-0154?

CVE-2018-0154 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-2018-0154 being actively exploited?

Yes. CVE-2018-0154 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2022-03-03, which means active exploitation has been confirmed. It should be prioritised for remediation.

What products are affected by CVE-2018-0154?

CVE-2018-0154 affects Cisco Ios. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2018-0154?

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-2018-0154 have an EU (EUVD) identifier?

Yes. CVE-2018-0154 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2018-0977. It is also flagged as exploited in the EUVD (since 2022-03-03).

When was CVE-2018-0154 published?

CVE-2018-0154 was published on 2018-03-28 and last updated on 2026-06-17.

CVE-2018-0154

CVE-2018-0154 is a high-severity vulnerability in Cisco Ios with a CVSS 3.x base score of 7.5. It is listed in CISA's Known Exploited Vulnerabilities (KEV) catalog, confirming it has been exploited in the wild (added 2022-03-03). The underlying weakness is classified as CWE-399.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 7.8
EPSS exploit prediction: 7% (93rd percentile)
Actively exploited: Yes — listed in CISA KEV (added 2022-03-03)
EU (EUVD) id: EUVD-2018-0977
EU exploitation: Flagged exploited in the ENISA EU Vulnerability Database (since 2022-03-03)
Weakness: CWE-399
Affected product: Cisco Ios
Published: 2018-03-28
Last modified: 2026-06-17

Description

A vulnerability in the crypto engine of the Cisco Integrated Services Module for VPN (ISM-VPN) running Cisco IOS Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. The vulnerability is due to insufficient handling of VPN traffic by the affected device. An attacker could exploit this vulnerability by sending crafted VPN traffic to an affected device. A successful exploit could allow the attacker to cause the affected device to hang or crash, resulting in a DoS condition. Cisco Bug IDs: CSCvd39267.

Frequently asked questions

What is CVE-2018-0154?: A vulnerability in the crypto engine of the Cisco Integrated Services Module for VPN (ISM-VPN) running Cisco IOS Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. The vulnerability is due to insufficient handling of VPN traffic by the affected device. An attacker could exploit this vulnerability by sending crafted VPN traffic to an affected device. A successful exploit could allow the attacker to cause the affected device to hang or crash, resulting in a DoS condition. Cisco Bug IDs: CSCvd39267.
How severe is CVE-2018-0154?: CVE-2018-0154 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-2018-0154 being actively exploited?: Yes. CVE-2018-0154 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2022-03-03, which means active exploitation has been confirmed. It should be prioritised for remediation.
What products are affected by CVE-2018-0154?: CVE-2018-0154 affects Cisco Ios. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2018-0154?: 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-2018-0154 have an EU (EUVD) identifier?: Yes. CVE-2018-0154 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2018-0977. It is also flagged as exploited in the EUVD (since 2022-03-03).
When was CVE-2018-0154 published?: CVE-2018-0154 was published on 2018-03-28 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:o:cisco:ios:-:*:*:*:*:*:*:*

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