How severe is CVE-2018-0409?

CVE-2018-0409 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-2018-0409 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (88th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2018-0409?

CVE-2018-0409 primarily affects Cisco Telepresence Video Communication Server. In total, 13 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2018-0409?

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-2018-0409 published?

CVE-2018-0409 was published on 2018-08-15 and last updated on 2026-06-17.

CVE-2018-0409

CVE-2018-0409 is a high-severity vulnerability in Cisco Telepresence Video Communication Server with a CVSS 3.x base score of 7.5. 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-125.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 3% (88th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-125
Affected product: Cisco Telepresence Video Communication Server
Published: 2018-08-15
Last modified: 2026-06-17

Description

A vulnerability in the XCP Router service of the Cisco Unified Communications Manager IM & Presence Service (CUCM IM&P) and the Cisco TelePresence Video Communication Server (VCS) and Expressway could allow an unauthenticated, remote attacker to cause a temporary service outage for all IM&P users, resulting in a denial of service (DoS) condition. The vulnerability is due to improper validation of user-supplied input. An attacker could exploit this vulnerability by sending a malicious IPv4 or IPv6 packet to an affected device on TCP port 7400. An exploit could allow the attacker to overread a buffer, resulting in a crash and restart of the XCP Router service. Cisco Bug IDs: CSCvg97663, CSCvi55947.

Frequently asked questions

What is CVE-2018-0409?: A vulnerability in the XCP Router service of the Cisco Unified Communications Manager IM & Presence Service (CUCM IM&P) and the Cisco TelePresence Video Communication Server (VCS) and Expressway could allow an unauthenticated, remote attacker to cause a temporary service outage for all IM&P users, resulting in a denial of service (DoS) condition. The vulnerability is due to improper validation of user-supplied input. An attacker could exploit this vulnerability by sending a malicious IPv4 or IPv6 packet to an affected device on TCP port 7400. An exploit could allow the attacker to overread a buffer, resulting in a crash and restart of the XCP Router service. Cisco Bug IDs: CSCvg97663, CSCvi55947.
How severe is CVE-2018-0409?: CVE-2018-0409 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-2018-0409 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (88th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2018-0409?: CVE-2018-0409 primarily affects Cisco Telepresence Video Communication Server. In total, 13 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2018-0409?: 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-2018-0409 published?: CVE-2018-0409 was published on 2018-08-15 and last updated on 2026-06-17.

References

Affected products (13)

cpe:2.3:a:cisco:telepresence_video_communication_server:x7.0.1:*:*:*:*:*:*:*
cpe:2.3:a:cisco:telepresence_video_communication_server:x7.2.4:*:*:*:*:*:*:*
cpe:2.3:a:cisco:telepresence_video_communication_server:x8.1:*:*:*:*:*:*:*
cpe:2.3:a:cisco:telepresence_video_communication_server:x8.2.2:*:*:*:*:*:*:*
cpe:2.3:a:cisco:telepresence_video_communication_server:x8.5:*:*:*:*:*:*:*
cpe:2.3:a:cisco:telepresence_video_communication_server:x8.6:*:*:*:*:*:*:*
cpe:2.3:a:cisco:telepresence_video_communication_server:x8.7:*:*:*:*:*:*:*
cpe:2.3:a:cisco:telepresence_video_communication_server:x8.8:*:*:*:*:*:*:*
cpe:2.3:a:cisco:telepresence_video_communication_server:x8.9:*:*:*:*:*:*:*
cpe:2.3:a:cisco:telepresence_video_communication_server:x8.10:*:*:*:*:*:*:*
cpe:2.3:a:cisco:telepresence_video_communication_server:x8.10.4:*:*:*:*:*:*:*
cpe:2.3:a:cisco:unified_communications_manager_im_and_presence_service:11.5:*:*:*:*:*:*:*
cpe:2.3:a:cisco:unified_communications_manager_im_and_presence_service:11.5\(1\):*:*:*:*:*:*:*

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