CVE-2019-18863: mitel 6863i_firmware Inadequate Encryption Strength
Vulnerability summary
CVE-2019-18863 is a medium (CVSS 5.9) Inadequate Encryption Strength vulnerability in mitel 6863i_firmware. EPSS estimates a 0.51% chance of exploitation in the next 30 days, higher than 43.8% of scored vulnerabilities.
Not severe (CVSS 5.9, network access); no exploitation reported by the 5 checked sources
Source freshness unavailable
How is this decided?Timeline
- 02-03-2020PublishedVulnerability first disclosed.
- 05-08-2024Last modifiedVulnerability information updated.
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.
CVSS metrics
2 scores · 1 source · 2 versionsEPSS trend
Probability
0.51%
Chance of exploitation in the next 30 days
Percentile
44%
Versus all other CVEs
30-day change
No change 0.00 pp
From 0.51% on 04-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.
Mitel8 products
- 6863i_firmware< 5.1.0.2051 | 5.1.0.2051 | 5.1.0.2051:sp2_hf2
- 6865i_firmware< 5.1.0.2051 | 5.1.0.2051 | 5.1.0.2051:sp2_hf2
- 6867i_firmware< 5.1.0.2051 | 5.1.0.2051 | 5.1.0.2051:sp2_hf2
- 6869i_firmware< 5.1.0.2051 | 5.1.0.2051 | 5.1.0.2051:sp2_hf2
- 6873i_firmware< 5.1.0.2051 | 5.1.0.2051 | 5.1.0.2051:sp2_hf2
1 vendor · 8 products
References
2 links- www.mitel.com/support/security-advisories/mitel-product-security-advisory-19-0006X Refsource CONFIRMVendor Advisory