Vulnerability report

Exploitation attempts observed Confirmed confidence Not in CISA KEV

CVE-2021-41569

SAS/Intrnet

SAS Institute / SAS/Intrnet

Watch CVE-2021-41569 Browse KEV feed
Severity
CVSS 7.5 · High
Confidence
Confirmed
Exploit status
Observed in sensors
EPSS
8.0%
First observed
12 Jun 2026
Last observed
18 Oct 2026

Decision summary

What security teams need to know first

Direct answers before the deeper technical record.

What it is

CVE-2021-41569 is an unauthenticated vulnerability affecting SAS Institute SAS/Intrnet. SAS/Intrnet 9.4 build 1520 and earlier allows Local File Inclusion. The samples library (included by default) in the appstart.sas...

Have exploitation attempts been observed?

Yes. Previdian sensors observed exploitation attempts targeting this vulnerability. Also reported by third-party sources. Confidence is confirmed.

Who is affected?

SAS Institute / SAS/Intrnet.

What should we do?

Patch immediately, validate internet-facing exposure, and monitor for matching requests.

Overview

SAS/Intrnet 9.4 build 1520 and earlier allows Local File Inclusion

SAS/Intrnet 9.4 build 1520 and earlier allows Local File Inclusion. The samples library (included by default) in the appstart.sas file, allows end-users of the application to access the sample.webcsf1.sas program, which contains user-controlled macro variables that are passed to the DS2CSF macro.

Users can escape the context of the configured user-controllable variable and append additional functions native to the macro but not included as variables within the library. This includes a function that retrieves files from the host OS.

Published
19 Nov 2021
Exploitation Attempts Reported
07 Jun 2026
Attack vector
Remote
Complexity
Low
Privileges
None
User interaction
None

Tags

nuclei_scanner

CVE References

Exploitation evidence

Evidence of exploitation attempts

Third-party attestation and first-party sensor observation are shown separately so teams can judge the evidence chain.

Exploitation attempts observed in the wild

The Shadowserver

Recorded 07 Jun 2026

A trusted third party reported exploitation attempts.

Exploitation attempts observed

Previdian sensor

First observed 12 Jun 2026

Previdian sensors observed exploitation attempts targeting this vulnerability.

Proof of concept available

Nuclei Templates

Recorded 12 Jun 2026

Public scanner or PoC coverage increases practical exploitability.

Known exploited vulnerability sources

Per-source evidence links for KEV attestations are available through the Previdian Pro API.

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Source Added
The Shadowserver First 2026-06-07 00:00 UTC
Previdian Sensors 2026-09-22 14:15 UTC

Operational indicators for this CVE are listed under Detection.

Sensor telemetry

First-party evidence of exploitation activity

Previdian sensors recorded exploitation attempts targeting this vulnerability. The cards and chart show volume, unique attackers, and daily activity.

5

Attempts observed

4

Unique attacker IPs

3

Attacker countries

LT · US · YE

5

Sensors observed

CVE-2021-41569 exploitation attempts over the last 68 days

Daily events observed by Previdian sensors

Updated 25 Oct 2026

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19 Aug 2 Sep 16 Sep 30 Sep 25 Oct

First observed 12 Jun 2026 · Last observed 18 Oct 2026

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Detection

Operational artifacts and observed signals

Make the evidence actionable in scanner, SOC, and edge-control workflows.

Observed signals

Request targets
User-Agents
Callback hosts
1
1
0

Request targets and User-Agents available in Pro. Callback host details available in Enterprise.

Virtual patch status

No Previdian virtual patch is currently available. Future rules ship for ModSecurity, Cloudflare, and AWS WAF.

Learn about virtual patches →

Attacker IP Indicators

Attacker IP indicators observed · available in Pro and Enterprise.

Sensor-derived attacker IP indicators are available to Pro and Enterprise accounts under Detection and through the Pro API.

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Scanner Artifacts

Scanner and exploit-framework references linked to this CVE.

Scanner Reference Detected
Nuclei https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2021/CVE-2021-41569.yaml 25 Apr 2025

Risk and context

Severity, weaknesses, and research context

CVSS v3.1

7.5 High

Potential damage if exploited. Separate from whether attackers are using it.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

EPSS

8.0%

Estimated chance of exploitation in the next 30 days. Previdian's warning comes from evidence, not this score.

Weaknesses

Inclusion of Functionality from Untrusted Control Sphere CWE-829

All CVSS Scores

CVSS v3.1 7.5 High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

CVSS v2.0 5.0 Medium

AV:N/AC:L/Au:N/C:P/I:N/A:N

Potential Proof of Concepts

These PoCs are unverified and could contain malware. Use at your own risk.

SAS/Internet 9.4 1520 - Local File Inclusion

nuclei · Created Unknown

Timeline

From disclosure to observed exploitation attempts

  1. 14:20 UTC

    Public PoC available

    Public proof-of-concept code published

  2. 00:35 UTC

    Indicators of compromise added (8)

    Indicators of compromise recorded

  3. 00:35 UTC

    Observed by Previdian sensors

    Previdian sensors observed exploitation attempts targeting this vulnerability.

  4. 00:00 UTC

    Added to Previdian KEV Feed

    High-confidence, third-party report of exploitation attempts

  5. 00:00 UTC

    Nuclei template available

    Scanner coverage available

  6. 17:14 UTC

    CVE published

    Vulnerability disclosed publicly

  7. 00:00 UTC

    CVE ID reserved

    Identifier reserved by the CNA

Pro API

Automate this intelligence

Confidence, exploit status, sensor telemetry, PoCs, scanner integrations, mentions, and tags are available programmatically for VM, SOC, and CTI workflows.

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  • Evidence confidence and provenance
  • First-party sensor telemetry
  • PoC and scanner references
  • Affected versions and enrichment
  • Automation-ready JSON delivery

GET /api/v2/pro/kevs/CVE-2021-41569

Sample API response 
{
  "cve_id": "CVE-2021-41569",
  "confidence": "Confirmed",
  "cvss_score": 7.5,
  "cvss_estimated": false,
  "epss_score": 0.07968,
  "exploit_status": {
    "exploited_in_the_wild": true,
    "active_exploitation_observed": true
  },
  "sensor_telemetry": { "attempts": 5, "sensors": 5 }
}