CVE-2020-3155Network attack vector

Content interception via unvalidated endpoint certificates

Published Mar 4, 2020 · Updated Nov 15, 2024

Improper certificate validation in Cisco Jabber for Android allows man-in-the-middle attackers to read or alter shared content. The Intelligent Proximity SSL client accepts a forged server certificate without validating the endpoint, allowing an intercepted connection to impersonate the collaboration device. Exploitation requires an on-path position, Proximity enabled on both the client and an on-premises endpoint, and exposes presentation content or call controls.

CVSS severity7.4
High
EPSS probability0.90%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper certificate validation in Cisco Jabber for Android allows man-in-the-middle attackers to read or alter shared content. The Intelligent Proximity SSL client accepts a forged server certificate without validating the endpoint, allowing an intercepted connection to impersonate the collaboration device. Exploitation requires an on-path position, Proximity enabled on both the client and an on-premises endpoint, and exposes presentation content or call controls.

The record

CVE
CVE-2020-3155
Published
Mar 4, 2020
Updated
Nov 15, 2024
Vendor
Cisco
Product
Cisco Jabber for Android
Classifications
CWE-295, T1557
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 4, 2020CVE publishedPublication date reported by the CVE source.
  2. Nov 15, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=unspecified <n/a

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Cisco · Cisco Jabber for Androidversion=unspecified <n/a

Published CVSS scores

7.4CiscoCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N/E:X/RL:X/RC:X

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-295Improper Certificate Validation
T1557Adversary-in-the-Middle

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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