How severe is CVE-2018-5779?

CVE-2018-5779 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-2018-5779 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (85th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2018-5779?

CVE-2018-5779 primarily affects Mitel Connect Onsite. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2018-5779?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2018-5779 published?

CVE-2018-5779 was published on 2018-03-14 and last updated on 2026-06-17.

CVE-2018-5779

CVE-2018-5779 is a critical-severity vulnerability in Mitel Connect Onsite with a CVSS 3.x base score of 9.8. 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-94.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 10.0
EPSS exploit prediction: 3% (85th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-94
Affected product: Mitel Connect Onsite
Published: 2018-03-14
Last modified: 2026-06-17

Description

A vulnerability in the conferencing component of Mitel Connect ONSITE, versions R1711-PREM and earlier, and Mitel ST 14.2, release GA28 and earlier, could allow an unauthenticated attacker to copy a malicious script into a newly generated PHP file and then execute the generated file using specially crafted requests. Successful exploit could allow an attacker to execute arbitrary code within the context of the application.

Frequently asked questions

What is CVE-2018-5779?: A vulnerability in the conferencing component of Mitel Connect ONSITE, versions R1711-PREM and earlier, and Mitel ST 14.2, release GA28 and earlier, could allow an unauthenticated attacker to copy a malicious script into a newly generated PHP file and then execute the generated file using specially crafted requests. Successful exploit could allow an attacker to execute arbitrary code within the context of the application.
How severe is CVE-2018-5779?: CVE-2018-5779 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-2018-5779 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (85th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2018-5779?: CVE-2018-5779 primarily affects Mitel Connect Onsite. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2018-5779?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2018-5779 published?: CVE-2018-5779 was published on 2018-03-14 and last updated on 2026-06-17.

References

https://www.mitel.com/support/security-advisories/mitel-product-security-advisory-18-0004

Affected products (2)

cpe:2.3:a:mitel:connect_onsite:*:*:*:*:*:*:*:*
cpe:2.3:a:mitel:st14.2:*:*:*:*:*:*:*:*

More vulnerabilities in Mitel Connect Onsite

CVE-2018-5782 — Critical (CVSS 9.8): A vulnerability in the conferencing component of Mitel Connect ONSITE, versions R1711-PREM and earlier, and Mitel ST…
CVE-2018-5781 — Critical (CVSS 9.8): A vulnerability in the conferencing component of Mitel Connect ONSITE, versions R1711-PREM and earlier, and Mitel ST…
CVE-2018-5780 — Critical (CVSS 9.8): A vulnerability in the conferencing component of Mitel Connect ONSITE, versions R1711-PREM and earlier, and Mitel ST…
CVE-2019-9593 — Medium (CVSS 6.1): A reflected Cross-site scripting (XSS) vulnerability in ShoreTel Connect ONSITE 18.82.2000.0 allows remote attackers to…
CVE-2019-9592 — Medium (CVSS 6.1): A reflected Cross-site scripting (XSS) vulnerability in ShoreTel Connect ONSITE 19.45.1602.0 allows remote attackers to…
CVE-2019-9591 — Medium (CVSS 6.1): A reflected Cross-site scripting (XSS) vulnerability in ShoreTel Connect ONSITE before 19.49.1500.0 allows remote…

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