Security readout for executives and security teams
Plain-English summary
curl/libcurl before 7.52.1 could use an uninitialized or weak random value. Randomness supports security-sensitive behavior, so weak values can reduce protection for operations that depend on it. This is a medium-severity maintenance risk, not evidence of compromise.
Executive priority
Schedule remediation through normal vulnerability management, with faster handling for exposed systems that use curl/libcurl in security-sensitive data flows. There is no source-backed indication of active exploitation.
Technical view
The issue is CWE-665 in libcurl's internal function for producing a 32-bit random value. The source bundle says weak or virtually absent randomness makes dependent operations vulnerable. CVSS 3.0 is 6.5 with low confidentiality and integrity impact and no availability impact.
Likely exposure
Exposure is most likely on systems or embedded products using curl/libcurl before 7.52.1, including applications that bundle or statically link libcurl. Vendor-patched distribution builds may differ from upstream version numbers.
Exploitation context
The bundle does not identify active exploitation, and KEV is false. It also does not provide exploit details or confirm which libcurl operations become practically exploitable in specific deployments.
Researcher notes
Evidence is limited to advisory-level detail. The vulnerability centers on uninitialized randomness, but the bundle does not name affected protocols, triggering operations, or reliable exploitability conditions. Validate exposure by dependency version and vendor fix status.
Mitigation direction
- Update curl/libcurl to a vendor-fixed build, at least 7.52.1 where applicable.
- Check operating system vendor advisories for backported fixes.
- Rebuild or update applications that bundle or statically link libcurl.
- Prioritize internet-facing services and systems handling sensitive authentication flows.
Validation and detection
- Inventory installed curl and libcurl versions across servers, containers, and appliances.
- Review SBOMs or build manifests for bundled or static libcurl copies.
- Confirm package changelogs reference CVE-2016-9594 or the vendor advisory fix.
- Retest affected applications after updating libcurl dependencies.
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-665: 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-2016-9594 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
- Medium
- CVSS
- 6.5 (3.0)
- Known Exploited
- No
- Published
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
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:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N3.92.5Primary CVE scoreVulnerability scoring details
Base CVSS 3.0 score
6.5MediumVector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Source materials
- CVE List V5 sourceCVE List V5
- https://curl.haxx.se/docs/adv_20161223.htmlCVE reference · x_refsource_CONFIRM
- https://www.tenable.com/security/tns-2017-04CVE reference · x_refsource_CONFIRM
- GLSA-201701-47CVE reference · vendor-advisory, x_refsource_GENTOO
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2016-9594CVE 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.
Improper Initialization
Improper Initialization represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.