CVE-2021-43302Network attack vector

Memory disclosure or crash via short recorder filename

Published Feb 16, 2022 · Updated Nov 4, 2025

Out-of-bounds read in Teluu PJSIP 2.11.1 and earlier allows attackers to read adjacent memory or crash applications via a short filename. pjsua_recorder_create examines the filename suffix without first ensuring that the supplied filename contains at least four bytes. Exploitation requires a consuming application to pass attacker-controlled filename data into the recorder API; PJSIP exposes no direct network call to this API.

CVSS severity9.1
Critical
EPSS probability2.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds read in Teluu PJSIP 2.11.1 and earlier allows attackers to read adjacent memory or crash applications via a short filename. pjsua_recorder_create examines the filename suffix without first ensuring that the supplied filename contains at least four bytes. Exploitation requires a consuming application to pass attacker-controlled filename data into the recorder API; PJSIP exposes no direct network call to this API.

The record

CVE
CVE-2021-43302
Published
Feb 16, 2022
Updated
Nov 4, 2025
Vendor
Teluu
Product
PJSIP
Classifications
CWE-125
Attack vector
network
Privileges
unauthenticated

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 vectornetwork
Required privilegesunauthenticated

What is affected?

Teluu · PJSIPversion=unspecified <=2.11.1

Published CVSS scores

6.4NIST NVDAV:N/AC:L/Au:N/C:P/I:N/A:P
9.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-125Out-of-bounds Read

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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