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CVE Record

CVE-2021-29377: Pear Admin Think through 2.1.2 has an arbitrary file upload vulnerability that allows attackers to execute...

Pear Admin Think through 2.1.2 has an arbitrary file upload vulnerability that allows attackers to execute arbitrary code remotely. A .php file can be uploaded via admin.php/index/upload because app/common/service/UploadService.php mishandles fileExt.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

Pear Admin Think through 2.1.2 reportedly lets an attacker upload a PHP file through an upload endpoint, which could lead to remote code execution. Business risk is meaningful if the product is internet-facing or used for administration. The public record does not provide CVSS, CPEs, patch status, or confirmed exploitation.

Executive priority

Prioritize verification where Pear Admin Think supports administrative workflows or is internet-facing. If present, treat as urgent hardening and investigation work because the stated impact is remote code execution, even though exploitation and patch details are not confirmed in the provided sources.

Technical view

The CVE states admin.php/index/upload is affected because app/common/service/UploadService.php mishandles fileExt, allowing a .php upload. That can convert a file-upload flaw into arbitrary remote code execution. Available sources identify the route and component but do not describe authentication, exploit prerequisites, fixed versions, or defensive configuration.

Likely exposure

Exposure appears limited to Pear Admin Think deployments through version 2.1.2 with the upload route reachable. The source bundle lists no CPEs and marks vendor/product as unavailable, so asset discovery may require repository, package, or codebase searches rather than scanner CPE matching.

Exploitation context

CISA KEV is false in the bundle, and no cited source confirms active exploitation. The vulnerability class is serious because arbitrary PHP upload can enable server-side code execution, but public evidence here is sparse and should be treated as incomplete.

Researcher notes

The record is thin: no CVSS, CWE, CPE, authentication context, exploit confirmation, or fixed version is supplied. The key source-grounded facts are affected version scope through 2.1.2, route admin.php/index/upload, component UploadService.php, mishandled fileExt, and PHP upload leading to remote code execution.

Mitigation direction

  • Identify any Pear Admin Think deployments at or below version 2.1.2.
  • Check the Gitee issue and vendor repository for fixed releases or guidance.
  • Restrict access to admin.php/index/upload until vendor guidance is confirmed.
  • Review upload handling to block executable server-side extensions.
  • Inspect uploaded-file directories for unexpected PHP files.

Validation and detection

  • Confirm whether Pear Admin Think is present in application inventories or source repositories.
  • Verify installed versions against the affected through-2.1.2 statement.
  • Review app/common/service/UploadService.php for fileExt validation behavior.
  • Check web logs for requests to admin.php/index/upload.
  • Look for unexpected PHP files in upload storage paths.
Prepared
Confidence
medium
Sources
3

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

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.

description · low confidence lookup

Execution 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 lookup
description · low confidence lookup

File access behavior lookup

The CVE wording references file access or upload behavior, so file telemetry and web shell review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.

Open ATT&CK lookup
cve · low confidence lookup

CVE-2021-29377 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

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.

0CVSS vectors
0Timeline events
0ADP providers
2Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
n/an/an/aListed
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.