Security readout for executives and security teams
Plain-English summary
This flaw is a memory corruption issue in IrfanView's B3D plugin before version 4.56. The source bundle rates it critical because successful exploitation could affect confidentiality, integrity, and availability. The provided evidence does not identify active exploitation or detailed affected product metadata.
Executive priority
Prioritize remediation where IrfanView is used to handle outside files or customer-supplied media. The risk is critical by score, but evidence for active exploitation is not present in the supplied sources.
Technical view
CVE-2020-13879 is reported as a CWE-787 heap-based out-of-bounds write in B3d.dll at offset +214f in IrfanView B3D PlugIns before 4.56. The CVSS 3.1 score is 9.8, but the bundle does not describe the attack path beyond the vulnerable component and version boundary.
Likely exposure
Exposure is most likely on systems with IrfanView and the B3D PlugIns installed below version 4.56. The source bundle lacks CPEs and normalized vendor/product fields, so asset validation depends on local software and plugin inventory.
Exploitation context
The CVE is not listed as KEV in the provided bundle. A public GitHub Gist reference exists, but the supplied evidence does not support claiming active exploitation. Treat the issue as high urgency because of severity, not confirmed in-the-wild activity.
Researcher notes
The record has sparse affected-product metadata: vendor, product, versions, and CPEs are listed as n/a except for the textual IrfanView B3D PlugIns before 4.56 description. Validate against installed plugin artifacts rather than relying only on vulnerability scanner CPE matching.
Mitigation direction
- Update IrfanView B3D PlugIns to version 4.56 or later.
- Check IrfanView vendor guidance for current supported plugin packages.
- Remove unsupported or unnecessary B3D plugin installations where business use is absent.
- Prioritize remediation on workstations handling externally supplied files.
Validation and detection
- Inventory endpoints for IrfanView and installed B3D plugin versions.
- Confirm B3d.dll is absent or from B3D PlugIns 4.56 or later.
- Review software deployment records for older plugin packages.
- Check security telemetry for crashes involving B3d.dll.
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-787: 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-2020-13879 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
- Critical
- CVSS
- 9.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/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:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H3.95.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
9.8CriticalVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://gist.github.com/oicu0619/878b8c37f238f4de5ff543973ef083f5CVE 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 Write
Out-of-bounds Write represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.