Security readout for executives and security teams
Plain-English summary
Apache Traffic Server could misread request header information about protocol versus scheme, letting a logged-in attacker request resources intended to be secure. The public data rates this as medium severity with limited confidentiality and integrity impact. It is important for organizations using Traffic Server as a reverse proxy or edge cache, but the provided sources do not show active exploitation.
Executive priority
Schedule remediation in the normal vulnerability patch cycle, accelerated for internet-facing Traffic Server deployments protecting sensitive resources. The impact is limited, but the flaw sits at a trust boundary and may undermine access-control assumptions.
Technical view
CVE-2021-37150 is an improper input validation flaw in Apache Traffic Server header parsing. A protocol/scheme mismatch can allow secure-resource requests that should not be permitted. Affected versions are Apache Traffic Server 8.0.0 through 9.1.2. CVSS 3.1 is 4.2: network reachable, high complexity, low privileges required, no user interaction, limited confidentiality and integrity impact.
Likely exposure
Exposure is limited to deployments running Apache Traffic Server 8.0.0 through 9.1.2, especially where Traffic Server enforces or influences access to secure resources. Systems not using Apache Traffic Server are not affected based on the provided sources.
Exploitation context
The source bundle does not identify public exploitation, and the CVE is not listed as KEV. CVSS indicates exploitation requires network access, low privileges, and high attack complexity. Treat this as a targeted access-control risk rather than a broadly exploitable unauthenticated takeover.
Researcher notes
Key evidence is the CVE description, CVSS vector, affected range, Apache reference, and Debian/Fedora advisories. The provided bundle does not include detailed root-cause code, exploit proof, or exact upstream fixed version, so validation should focus on version exposure and vendor package status.
Mitigation direction
- Inventory Apache Traffic Server instances and package versions.
- Prioritize upgrading affected 8.0.0 through 9.1.2 deployments using vendor guidance.
- Apply Debian or Fedora security updates where those packages are used.
- Review proxy rules protecting secure resources for scheme-dependent assumptions.
- Monitor Apache Traffic Server advisories for exact fixed-version guidance.
Validation and detection
- Confirm whether Apache Traffic Server is deployed in production or edge paths.
- Check installed Traffic Server versions against 8.0.0 through 9.1.2.
- Verify OS packages include the referenced Debian or Fedora security update.
- Review access logs for unusual secure-resource requests from authenticated users.
- Confirm regression tests cover scheme and protocol handling at protected routes.
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-20: 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-2021-37150 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
- 4.2 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:H/PR:L/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:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N1.62.5Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
4.2MediumVector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N
Source materials
- CVE List V5 sourceCVE List V5
- https://lists.apache.org/thread/rc64lwbdgrkv674koc3zl1sljr9vwg21CVE reference
- DSA-5206CVE reference · vendor-advisory
- FEDORA-2022-9832c0c04bCVE reference · vendor-advisory
- FEDORA-2022-23043f5a0bCVE reference · vendor-advisory
- [debian-lts-announce] 20230123 [SECURITY] [DLA 3279-1] trafficserver security updateCVE reference · mailing-list
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 Input Validation
Improper Input Validation represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.