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CVE-2021-36701: In htmly version 2.8.1, is vulnerable to an Arbitrary File Deletion on the local host when delete backup fi...

In htmly version 2.8.1, is vulnerable to an Arbitrary File Deletion on the local host when delete backup files. The vulnerability may allow a remote attacker to delete arbitrary know files on the host.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysisunknown

Security readout for executives and security teams

Plain-English summary

HTMly 2.8.1 is reported to allow deletion of arbitrary known files on the host through backup-file deletion behavior. This can disrupt a website or remove important local files. The public record does not provide CVSS, CWE, fixed version, or detailed scope.

Executive priority

Prioritize inventory and containment for any internet-facing htmly 2.8.1 sites. Business urgency is uncertain because severity and exploitation evidence are missing, but arbitrary file deletion can affect availability and recovery if backups or configuration files are removed.

Technical view

CVE-2021-36701 describes arbitrary local file deletion in htmly 2.8.1 when deleting backup files. The issue may be remotely triggerable, but the provided sources do not define authentication requirements, affected paths, CVSS scoring, CWE classification, or a confirmed fix.

Likely exposure

Exposure is likely limited to deployments running htmly 2.8.1, especially if the backup deletion function is reachable by remote users. The CVE affected-product fields are incomplete, so confirm exposure from asset inventory and application version data.

Exploitation context

The source bundle does not show CISA KEV listing or cite active exploitation. It states a remote attacker may delete arbitrary known files, but does not provide exploit maturity, prerequisites, authentication context, or public attack evidence.

Researcher notes

Evidence is sparse. The CVE text and GitHub issue identify htmly 2.8.1 and arbitrary file deletion during backup deletion, but affected metadata is incomplete. Avoid assuming product range, authentication requirements, patched versions, or exploitation status without vendor confirmation.

Mitigation direction

  • Identify any htmly 2.8.1 deployments in production or staging.
  • Check the upstream issue and vendor releases for fixed versions or workarounds.
  • Restrict access to administrative and backup-management functions.
  • Ensure reliable, offline backups exist for website content and configuration.
  • Monitor for unexpected backup deletion or file integrity changes.

Validation and detection

  • Confirm the installed htmly version on each relevant host.
  • Review whether backup deletion endpoints are exposed to untrusted users.
  • Check application logs for unusual backup or file deletion activity.
  • Validate restoration from recent clean backups.
  • Track the GitHub issue for remediation details before applying changes.
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

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-2021-36701 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.