Security readout for executives and security teams
Plain-English summary
GNOME libgfbgraph through 0.2.4 did not verify TLS certificates in part of its photo handling code. That means a suitably positioned network attacker could impersonate a remote service and intercept or alter traffic. Business urgency depends on whether affected Linux desktop or application workflows use this library on untrusted networks.
Executive priority
Treat this as a targeted remediation item, not an emergency by itself. Prioritize affected endpoints or workloads that process sensitive data over public or shared networks. The absence of KEV listing and missing CVSS lower urgency, but TLS trust failures can undermine confidentiality and integrity.
Technical view
The issue is in gfbgraph-photo.c creating SoupSessionSync objects without enabling TLS certificate verification. Sources describe SoupSessionSync and SoupSessionAsync defaulting to no certificate verification. The CVE names GNOME libgfbgraph through 0.2.4 as affected. No CVSS, CWE, or fixed upstream version is included in the bundle.
Likely exposure
Exposure is most likely on systems with GNOME libgfbgraph through 0.2.4 installed and applications that exercise its photo-related network code. The package being present alone does not prove exploitability; the vulnerable code path and an attacker with network interception capability are key conditions.
Exploitation context
The bundle does not show active exploitation, and KEV is false. Exploitation would require a network man-in-the-middle position against affected traffic. The vulnerability is not described as remote code execution; the apparent risk is trust failure for encrypted connections, enabling interception or tampering.
Researcher notes
Evidence is concise but coherent: CVE description names libgfbgraph through 0.2.4 and the specific TLS verification failure. The GNOME blog provides context for SoupSessionSync defaults. Fedora advisories indicate downstream handling, but the bundle does not provide a precise upstream fixed version or exploit details.
Mitigation direction
- Inventory systems for GNOME libgfbgraph packages at or below 0.2.4.
- Apply distribution or GNOME vendor updates for libgfbgraph where available.
- Review Fedora advisories for applicable package update guidance.
- Reduce use of affected applications on untrusted networks until patched.
- Check vendor guidance if no fixed version is visible in local package metadata.
Validation and detection
- Confirm installed libgfbgraph package versions across Linux desktop and image baselines.
- Identify applications that link to or depend on libgfbgraph.
- Review package changelogs for TLS certificate verification fixes.
- Verify vulnerable hosts received relevant distribution security updates.
- Document any remaining unpatched systems and compensating controls.
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.
CVE-2021-39358 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://gitlab.gnome.org/GNOME/libgfbgraph/-/issues/17CVE reference · x_refsource_MISC
- https://blogs.gnome.org/mcatanzaro/2021/05/25/reminder-soupsessionsync-and-soupsessionasync-default-to-no-tls-certificate-verification/CVE reference · x_refsource_MISC
- FEDORA-2021-7cccd2784cCVE reference · vendor-advisory, x_refsource_FEDORA
- FEDORA-2021-9c737bb848CVE reference · vendor-advisory, x_refsource_FEDORA
- FEDORA-2021-743a0aafa0CVE reference · vendor-advisory, x_refsource_FEDORA
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.