Security readout for executives and security teams
MuPDF 1.18.0 can mishandle memory while linearizing a PDF, freeing the same object twice. If a user or process handles a crafted document, the result could be memory corruption with serious confidentiality, integrity, and availability impact. Exposure is most likely on workstations, servers, or applications using MuPDF 1.18.0 to open, transform, linearize, preview, or process PDFs, especially untrusted documents. Treat as high priority where MuPDF processes external PDFs, because document-handling paths are common business entry points. Urgency is lower for systems without MuPDF 1.18.0 or untrusted PDF exposure. Mitigation focus: Inventory systems and applications using MuPDF 1.18.0 or bundled MuPDF libraries.; Apply MuPDF updates from the vendor or trusted distribution advisories.; Prioritize Fedora, Debian LTS, and Gentoo systems referenced by the advisories..
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-415: 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-2021-3407 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
- High
- CVSS
- 7.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
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 vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H1.85.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
7.8HighVector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- FEDORA-2021-d8e6f014e5CVE reference · vendor-advisory, x_refsource_FEDORA
- FEDORA-2021-572bb0f886CVE reference · vendor-advisory, x_refsource_FEDORA
- [debian-lts-announce] 20210311 [SECURITY] [DLA 2589-1] mupdf security updateCVE reference · mailing-list, x_refsource_MLIST
- FEDORA-2021-baeaa7bccbCVE reference · vendor-advisory, x_refsource_FEDORA
- GLSA-202105-30CVE reference · vendor-advisory, x_refsource_GENTOO
- https://bugs.ghostscript.com/show_bug.cgi?id=703366CVE 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.
Double Free
Double Free represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.