Security readout for executives and security teams
Plain-English summary
CVE-2021-43302 is a memory read flaw in PJSIP's PJSUA recorder creation API. If an application passes an attacker-controlled filename shorter than four characters, the library may read past expected memory. Business risk depends on whether products expose that API path to untrusted input.
Executive priority
Treat as a targeted dependency risk, not a broad emergency from the supplied evidence. Prioritize systems using voice, SIP, or recorder features where external users can influence recording filenames.
Technical view
The issue is a CWE-125 out-of-bounds read in pjsua_recorder_create involving short filename arguments. The source bundle names teluu pjsip and Debian advisories for pjproject and downstream packages. No CVSS, fixed version, or exploit proof is provided in the bundle.
Likely exposure
Exposure is most likely in applications or packaged software using PJSIP/PJPROJECT recorder functionality with untrusted filename input. Debian advisories indicate pjproject and downstream asterisk and ring packages received security updates, but affected version ranges are not specified here.
Exploitation context
The bundle does not show active exploitation, and KEV status is false. Exploitation would require control over the filename argument passed into pjsua_recorder_create, which may be internal-only in many deployments.
Researcher notes
Evidence is incomplete on versions, CVSS, and patch identifiers. Focus analysis on dependency reachability and whether short filename values can reach pjsua_recorder_create from untrusted sources. Do not assume remote exploitability without product-specific data flow evidence.
Mitigation direction
- Apply vendor security updates for pjproject or pjsip where available.
- Update Debian pjproject, asterisk, and ring packages if used.
- Check the GitHub advisory for fixed upstream guidance.
- Avoid passing untrusted short filenames to recorder creation paths.
- Monitor vendor advisories for exact affected and fixed versions.
Validation and detection
- Inventory systems and applications using PJSIP or PJPROJECT.
- Identify code paths calling pjsua_recorder_create.
- Check whether filename input can be attacker-controlled.
- Verify installed packages include relevant Debian security updates.
- Document any downstream products embedding vulnerable pjproject code.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-125: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2021-43302 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/pjsip/pjproject/security/advisories/GHSA-qcvw-h34v-c7r9CVE reference
- [debian-lts-announce] 20220328 [SECURITY] [DLA 2962-1] pjproject security updateCVE reference · mailing-list
- [debian-lts-announce] 20221117 [SECURITY] [DLA 3194-1] asterisk security updateCVE reference · mailing-list
- DSA-5285CVE reference · vendor-advisory
- [debian-lts-announce] 20230829 [SECURITY] [DLA 3549-1] ring security updateCVE reference · mailing-list
- https://lists.debian.org/debian-lts-announce/2024/09/msg00030.htmlCVE reference
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Out-of-bounds Read
Out-of-bounds Read represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.