Security readout for executives and security teams
Plain-English summary
Sonatype Nexus Repository 3 versions through 3.33.1-01 had an HTTP header injection issue. A remote attacker could send a crafted request that may expose sensitive information or cause the server to request external resources. Public data here does not provide a CVSS score or confirm exploitation.
Executive priority
Treat this as a targeted remediation item for any exposed Nexus Repository 3 deployment. Business urgency rises if Nexus is internet-facing, stores sensitive artifacts, or has broad outbound network access. Lack of severity data means prioritize based on exposure.
Technical view
CVE-2021-40143 is described as an HTTP header injection vulnerability in Nexus Repository 3.x through 3.33.1-01. The stated impact is potential sensitive information disclosure or external resource requests from a vulnerable instance. The source bundle does not provide CWE, CVSS, exploit detail, or a specific fixed version.
Likely exposure
Exposure is most likely where Nexus Repository 3.x through 3.33.1-01 is reachable by untrusted users or networks, especially internet-facing or partner-facing repository portals. The provided affected metadata is incomplete, so validate directly against deployed Nexus versions.
Exploitation context
The CVE states remote exploitation via a crafted HTTP request. CISA KEV status is false in the bundle, and no cited source confirms active exploitation. Do not assume exploitation without environment-specific evidence.
Researcher notes
The public bundle is thin: no CVSS, CWE, technical root cause, fixed version, or exploitation confirmation. Analysis should avoid assumptions beyond HTTP header injection, affected version range, and stated impacts.
Mitigation direction
- Inventory all Nexus Repository 3 instances and versions.
- Review Sonatype advisory and release notes for the supported fix path.
- Upgrade or apply vendor-recommended remediation where applicable.
- Restrict untrusted network access to Nexus management and repository endpoints.
- Review outbound network controls for unexpected external resource requests.
Validation and detection
- Confirm whether any instance runs 3.x through 3.33.1-01.
- Check whether affected instances are internet-facing or partner-facing.
- Review logs for unusual header patterns and unexpected outbound requests.
- Verify remediation against Sonatype guidance, not inferred version assumptions.
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-2021-40143 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://issues.sonatype.org/secure/ReleaseNote.jspaCVE reference · x_refsource_MISC
- https://support.sonatype.com/hc/en-us/articles/4405941762579CVE reference · x_refsource_CONFIRM
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.