CVE-2021-1503

Code execution via malformed recording file parsing

Published Jun 4, 2021 · Updated Nov 7, 2024

Memory corruption in Cisco Webex recording players before 41.2 allows attackers to execute code through a malicious ARF or WRF file. The players insufficiently validate values while parsing ARF and WRF recordings, allowing crafted fields to corrupt memory during playback. Exploitation requires a targeted user to open the file locally, and resulting code runs with that user's privileges.

CVSS severity7.8
High
EPSS probability1.02%
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 recording players before 41.2 allows attackers to execute code through a malicious ARF or WRF file. The players insufficiently validate values while parsing ARF and WRF recordings, allowing crafted fields to corrupt memory during playback. Exploitation requires a targeted user to open the file locally, and resulting code runs with that user's privileges.

The record

CVE
CVE-2021-1503
Published
Jun 4, 2021
Updated
Nov 7, 2024
Vendor
ClamAV
Product
Webex Meetings
Classifications
CWE-119, CWE-787, T1204.002, T1203
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 4, 2021CVE publishedPublication date reported by the CVE source.
  2. Nov 7, 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?

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  1. Affected versionversion=n/a

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

ClamAV · Webex Meetingsversion=n/a

Published CVSS scores

6.8NIST NVDAV:N/AC:M/Au:N/C:P/I:P/A:P
7.8CiscoCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/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.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-119Improper Restriction of Operations within the Bounds of a Memory Buffer
CWE-787Out-of-bounds Write
T1204.002User Execution: Malicious File
T1203Exploitation for Client Execution

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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