Security readout for executives and security teams
Plain-English summary
PoDoFo 0.9.7 has a parser flaw that can recurse without control and exhaust the stack. In business terms, software using this library to process PDFs may crash when it handles problematic PDF content. The available sources do not provide a CVSS score, confirmed fix, or evidence of exploitation.
Executive priority
Prioritize assessment where PDF parsing is internet-facing, customer-facing, or part of critical document workflows. With no CVSS, no KEV listing, and no cited active exploitation, treat urgency as environment-dependent rather than automatically severe.
Technical view
CVE-2021-30470 is CWE-674 uncontrolled recursion in PoDoFo 0.9.7. Recursive calls among PdfTokenizer::ReadArray(), PdfTokenizer::GetNextVariant(), and PdfTokenizer::ReadDataType() can cause stack overflow. The source bundle identifies PoDoFo 0.9.7 as affected and does not define impact beyond stack overflow.
Likely exposure
Likely exposure is applications or services that embed PoDoFo 0.9.7 and parse PDF files, especially PDFs supplied by users, customers, email, uploads, or automated document workflows. This is an exposure inference from the affected PDF library and tokenizer functions.
Exploitation context
The provided sources do not show active exploitation, public exploit use, KEV listing, or weaponized details. A plausible impact is denial of service through process crash, but the sources do not prove broader compromise or code execution.
Researcher notes
Evidence is sparse: the record names the recursive tokenizer call chain and stack overflow condition but provides no exploitability analysis, CVSS vector, patch details, or affected downstream products. Avoid expanding scope beyond PoDoFo 0.9.7 without separate evidence.
Mitigation direction
- Inventory applications and packages using PoDoFo 0.9.7.
- Check PoDoFo and distributor advisories for fixed versions or backports.
- Reduce or sandbox parsing of untrusted PDFs until remediation is confirmed.
- Apply vendor-supported updates when available.
- Monitor PDF-processing services for stack overflows or repeated crashes.
Validation and detection
- Review dependency manifests, SBOMs, and package inventories for PoDoFo 0.9.7.
- Identify services that parse PDFs using PoDoFo.
- Confirm whether PDF inputs come from untrusted or external sources.
- Check operational logs for crashes in PoDoFo tokenizer paths.
- Verify vendor guidance before marking the issue remediated.
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-674: 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-2021-30470 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://bugzilla.redhat.com/show_bug.cgi?id=1947436CVE reference · x_refsource_MISC
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.
Uncontrolled Recursion
Uncontrolled Recursion represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.