CVE-2021-43299

Application crash via unchecked media filename copy

Published Feb 16, 2022 · Updated Nov 4, 2025

Stack-based buffer overflow in Teluu PJSIP 2.11.1 and earlier allows attackers to crash applications via an overlong media filename. pjsua_player_create copies the caller-supplied filename into a PJ_MAXPATH-sized stack buffer without first rejecting excessive lengths. Exposure requires a consuming application to pass attacker-controlled filename data to the API; the documented consequence is memory corruption and application failure.

CVSS severity9.8
Critical
EPSS probability2.49%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack-based buffer overflow in Teluu PJSIP 2.11.1 and earlier allows attackers to crash applications via an overlong media filename. pjsua_player_create copies the caller-supplied filename into a PJ_MAXPATH-sized stack buffer without first rejecting excessive lengths. Exposure requires a consuming application to pass attacker-controlled filename data to the API; the documented consequence is memory corruption and application failure.

The record

CVE
CVE-2021-43299
Published
Feb 16, 2022
Updated
Nov 4, 2025
Vendor
Teluu
Product
PJSIP
Classifications
CWE-121
Attack vector
Unavailable
Privileges
Unavailable

Timeline

How it unfolded

  1. Feb 16, 2022CVE publishedPublication date reported by the CVE source.
  2. Nov 4, 2025Record 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 <=2.11.1

What conditions does exploitation require?

Attack vectorUnavailable in this record.
Required privilegesUnavailable in this record.

What is affected?

Teluu · PJSIPversion=unspecified <=2.11.1

Published CVSS scores

7.5NIST NVDAV:N/AC:L/Au:N/C:P/I:P/A:P
9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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)
VectorUnavailable
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-121Stack-based Buffer Overflow

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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