Security readout for executives and security teams
Plain-English summary
CVE-2021-33974 describes buffer overflow flaws in Qihoo 360 PC security and browser products that could allow arbitrary code execution. The highest-risk scenario is a user opening a malicious browser link. The record says the vendor fixed the issues, but it does not provide complete affected or fixed version data.
Executive priority
Treat this as high priority where Qihoo 360 endpoint or browser products are deployed. The business risk is full endpoint compromise after user interaction, with possible persistence through security software components. Urgency is lower where the products are absent.
Technical view
The CVE maps to CWE-120 and CVSS 3.1 score 8.8. Sources describe remote code execution in 360 Safe Browser/360 Chrome with user interaction, plus local client flaws in Qihoo antivirus components that could be chained for persistence. The official affected-product metadata is incomplete.
Likely exposure
Exposure is likely limited to endpoints running the named Qihoo 360 PC client or browser packages. Listed versions include 360 Safeguard 12.1.0.1004, 12.1.0.1005, 13.1.0.1001 and 360 Total Security 10.8.0.1060, 10.8.0.1213. Browser version data is truncated in the source.
Exploitation context
The source bundle describes remote exploitation after opening a link, but does not show KEV listing or active exploitation in the wild. It also describes local exploitation paths that may be chained with the browser issue. Treat the exploit-status evidence as limited.
Researcher notes
The CVE record is unusually broad and has incomplete structured affected-product data. The narrative names specific security-client versions and truncated browser information. Avoid over-scoping beyond Qihoo 360 products cited in the sources, and verify fixed builds from vendor-maintained channels.
Mitigation direction
- Inventory endpoints for Qihoo 360 Safeguard, Total Security, Safe Browser, and Chrome variants.
- Check Qihoo 360 vendor guidance for fixed versions and upgrade paths.
- Remove unsupported or legacy Qihoo 360 installers from managed software repositories.
- Prioritize patching systems where Qihoo 360 browsers are used for web access.
- Monitor EDR for unusual persistence activity on systems with affected software.
Validation and detection
- Confirm installed Qihoo 360 product names and versions on endpoints.
- Compare findings against the CVE-listed versions and vendor advisory data.
- Review web proxy or EDR telemetry for suspicious browser-triggered process activity.
- Check whether Qihoo 360 antivirus components show unexpected exclusions or persistence behavior.
- Document gaps where affected browser version data is incomplete.
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-120: 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 lookupExecution behavior lookup
The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2021-33974 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
- High
- CVSS
- 8.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/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:R/S:U/C:H/I:H/A:H2.85.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
8.8HighVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://memorycorruptor.blogspot.com/p/vulnerabilities-disclosures.htmlCVE reference
- https://pastebin.com/ms1ivjYeCVE 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.
Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
Buffer Copy without Checking Size of Input ('Classic Buffer Overflow') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.