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CVE-2020-13383· NVD / CVE Program· CNA mitre

openSIS through 7.4 allows Directory Traversal.

HighCVSS 7.5 · v3.1—Weaponized No fix recorded

Noroxi analysis

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Published
Jul 1, 2020
Updated
Jun 16, 2026
EPSS
67.8% · 99th percentile
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Report tools

JSON

Action score

50

Plan

Add it to your regular patch cycle.

CVSS
30 / 40 · 7.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
20 / 30 · 67.8%

Affected systems

VendorProduct
os4edopensis

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • os4ed opensisup to 7.4 inclusive

Same product

os4ed: all records

Other highest-scoring records for the same primary product.

  • CVE-2020-13381openSIS through 7.4 allows SQL Injection.
    57Plan
  • CVE-2020-13382openSIS through 7.4 has Incorrect Access Control.
    52Plan
  • CVE-2021-39378A SQL Injection vulnerability exists in openSIS 8.0 when MySQL (MariaDB) is being used as the application database.
    46Plan
  • CVE-2020-6637openSIS Community Edition version 7.3 is vulnerable to SQL injection via the USERNAME parameter of index.php.
    45Plan
  • CVE-2020-6142A remote code execution vulnerability exists in the Modules.php functionality of OS4Ed openSIS 7.3.
    42Plan
  • CVE-2021-40617An SQL Injection vulnerability exists in openSIS Community Edition version 8.0 via ForgotPassUserName.php.
    41Plan

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

No fix version is recorded for this entry. Check the references for vendor advisories.

Exploit status

Weaponized

A ready exploit tool or active in-the-wild use is known for this vulnerability. This should be your top priority.

Evidence

  • Metasploit module ×1

Noroxi does not host or link to exploit code. Metasploit module names and Nuclei template ids are shown (names, not code); Exploit-DB entries and PoC repositories are given as counts only.

Public exploit evidence
SourceKindDate
Metasploit moduleexploit/unix/webapp/opensis_chain_execopenSIS Unauthenticated PHP Code Executionexploit2020-06-30

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

  1. Metasploit-1 d
  2. Published
  3. TodaySep 30, 2026+2282 d
EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
none
Availability
none
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
None
Availability impact
None

Weakness class (CWE)

CWE-22 · Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

CVSS vector

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

nvd-primary

Root cause

A user-supplied file name is joined with the allowed directory, but the result is never checked to confirm it is still inside that directory.

The bug in code

The whole CWE-22 class

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

Vulnerable

ts
const file = path.join(ROOT, req.query.name);res.sendFile(file);

Fixed

ts
const file = path.resolve(ROOT, req.query.name);if (!file.startsWith(ROOT + path.sep)) {  return res.sendStatus(400);}res.sendFile(file);

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

ATT&CK techniques

—

Change log

No changes recorded on tracked fields yet. Score, KEV, exploit maturity and fix status changes appear here.

References

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records