How severe is CVE-2019-18863?

CVE-2019-18863 has a CVSS 3.x base score of 5.9, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2019-18863 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (40th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2019-18863?

CVE-2019-18863 primarily affects Mitel 6863i Firmware. In total, 24 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2019-18863?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2019-18863 published?

CVE-2019-18863 was published on 2020-03-02 and last updated on 2026-06-17.

CVE-2019-18863

CVE-2019-18863 is a medium-severity vulnerability in Mitel 6863i Firmware with a CVSS 3.x base score of 5.9. 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-326.

Key facts

Severity: Medium (CVSS 3.x base score 5.9)
CVSS v2: 4.3
EPSS exploit prediction: 1% (40th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-326
Affected product: Mitel 6863i Firmware
Published: 2020-03-02
Last modified: 2026-06-17

Description

A key length vulnerability in the implementation of the SRTP 128-bit key on Mitel 6800 and 6900 SIP series phones, versions 5.1.0.2051 SP2 and earlier, could allow an attacker to launch a man-in-the-middle attack when SRTP is used in a call. A successful exploit may allow the attacker to intercept sensitive information.

Frequently asked questions

What is CVE-2019-18863?: A key length vulnerability in the implementation of the SRTP 128-bit key on Mitel 6800 and 6900 SIP series phones, versions 5.1.0.2051 SP2 and earlier, could allow an attacker to launch a man-in-the-middle attack when SRTP is used in a call. A successful exploit may allow the attacker to intercept sensitive information.
How severe is CVE-2019-18863?: CVE-2019-18863 has a CVSS 3.x base score of 5.9, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2019-18863 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (40th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2019-18863?: CVE-2019-18863 primarily affects Mitel 6863i Firmware. In total, 24 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2019-18863?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2019-18863 published?: CVE-2019-18863 was published on 2020-03-02 and last updated on 2026-06-17.

References

Affected products (24)

cpe:2.3:o:mitel:6863i_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:mitel:6863i_firmware:5.1.0.2051:-:*:*:*:*:*:*
cpe:2.3:o:mitel:6863i_firmware:5.1.0.2051:sp2_hf2:*:*:*:*:*:*
cpe:2.3:o:mitel:6865i_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:mitel:6865i_firmware:5.1.0.2051:-:*:*:*:*:*:*
cpe:2.3:o:mitel:6865i_firmware:5.1.0.2051:sp2_hf2:*:*:*:*:*:*
cpe:2.3:o:mitel:6867i_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:mitel:6867i_firmware:5.1.0.2051:-:*:*:*:*:*:*
cpe:2.3:o:mitel:6867i_firmware:5.1.0.2051:sp2_hf2:*:*:*:*:*:*
cpe:2.3:o:mitel:6869i_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:mitel:6869i_firmware:5.1.0.2051:-:*:*:*:*:*:*
cpe:2.3:o:mitel:6869i_firmware:5.1.0.2051:sp2_hf2:*:*:*:*:*:*
cpe:2.3:o:mitel:6873i_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:mitel:6873i_firmware:5.1.0.2051:-:*:*:*:*:*:*
cpe:2.3:o:mitel:6873i_firmware:5.1.0.2051:sp2_hf2:*:*:*:*:*:*
cpe:2.3:o:mitel:6920_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:mitel:6920_firmware:5.1.0.2051:-:*:*:*:*:*:*
cpe:2.3:o:mitel:6920_firmware:5.1.0.2051:sp2_hf2:*:*:*:*:*:*
cpe:2.3:o:mitel:6930_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:mitel:6930_firmware:5.1.0.2051:-:*:*:*:*:*:*
cpe:2.3:o:mitel:6930_firmware:5.1.0.2051:sp2_hf2:*:*:*:*:*:*
cpe:2.3:o:mitel:6940_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:mitel:6940_firmware:5.1.0.2051:-:*:*:*:*:*:*
cpe:2.3:o:mitel:6940_firmware:5.1.0.2051:sp2_hf2:*:*:*:*:*:*

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