CVE-2020-3127

Code execution via uninitialized ARF parser access

Published Mar 4, 2020 · Updated Nov 15, 2024

Memory corruption in Cisco Webex players for Microsoft Windows allows remote attackers to execute code through a crafted recording file. The CVE-linked ZDI disclosure locates the flaw in Network Recording Player's ARF parser, where crafted data accesses memory before initialization. Execution requires a targeted user to open the file or visit a malicious page, and resulting code runs with that user's privileges.

CVSS severity7.8
High
EPSS probability2.31%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Memory corruption in Cisco Webex players for Microsoft Windows allows remote attackers to execute code through a crafted recording file. The CVE-linked ZDI disclosure locates the flaw in Network Recording Player's ARF parser, where crafted data accesses memory before initialization. Execution requires a targeted user to open the file or visit a malicious page, and resulting code runs with that user's privileges.

The record

CVE
CVE-2020-3127
Published
Mar 4, 2020
Updated
Nov 15, 2024
Vendor
Cisco
Product
Cisco Webex WRF Player
Classifications
CWE-20, T1203, T1204.002
Attack vector
local
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 vectorlocal
Required privilegesunauthenticated

What is affected?

Cisco · Cisco Webex WRF Playerversion=unspecified <n/a

Published CVSS scores

7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
7.8Cisco Systems, Inc.CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:X/RL:X/RC:X
9.3NIST NVDAV:N/AC:M/Au:N/C:C/I:C/A:C

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)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-20Improper Input Validation
T1203Exploitation for Client Execution
T1204.002Malicious File

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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