# CVE-2020-1993: PAN-OS: GlobalProtect Portal PHP session fixation vulnerability

> Attackers can hijack user sessions in PAN-OS GlobalProtect Portal by fixing session IDs, leading to account takeover.

- **Severity:** Low 3.7 (`CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:L/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 13 May 2020
- **Updated:** 16 Sep 2024
- **Also known as:** GHSA-w8pj-jc9c-cq4v

## What is CVE-2020-1993?

CVE-2020-1993 is a low-severity authentication bypass vulnerability in Paloaltonetworks Pan-Os, published on 13 May 2020. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.

### Official description

The GlobalProtect Portal feature in PAN-OS does not set a new session identifier after a successful user login, which allows session fixation attacks, if an attacker is able to control a user's session ID. This issue affects: All PAN-OS 7.1 and 8.0 versions; PAN-OS 8.1 versions earlier than 8.1.14; PAN-OS 9.0 versions earlier than 9.0.8.

Weakness: CWE-384 (Session Fixation)

## Which versions are affected by CVE-2020-1993?

It affects 1 product.


Products: Paloaltonetworks Pan-Os.

## How do I fix CVE-2020-1993?

No fix has been published for CVE-2020-1993 yet. Limit exposure of the affected software until one is available.

## Is CVE-2020-1993 being exploited?

There is no known exploitation of CVE-2020-1993 in the wild and no public exploit code.

## Other vulnerabilities in Paloaltonetworks Pan-Os

- [CVE-2024-3400](https://insights.sbomify.com/CVE-2024-3400/): Palo Alto Networks PAN-OS Command Injection (critical 10.0, exploited in the wild)
- [CVE-2020-2021](https://insights.sbomify.com/CVE-2020-2021/): Palo Alto Networks PAN-OS Authentication Bypass (critical 10.0, exploited in the wild)
- [CVE-2017-15944](https://insights.sbomify.com/CVE-2017-15944/): Palo Alto Networks PAN-OS Remote Code Execution (critical 9.8, exploited in the wild)
- [CVE-2026-0300](https://insights.sbomify.com/CVE-2026-0300/): Palo Alto Networks PAN-OS Out-of-bounds Write (critical 9.3, exploited in the wild)
- [CVE-2024-0012](https://insights.sbomify.com/CVE-2024-0012/): Palo Alto Networks PAN-OS Management Interface Authentication Bypass (critical 9.3, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-1993 and fix it if it is affected.

What it is: CVE-2020-1993 is a low-severity authentication bypass vulnerability in Paloaltonetworks Pan-Os, published on 13 May 2020. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2020-1993 in the wild and no public exploit code.

Affected product: Paloaltonetworks Pan-Os. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2020-1993/ (Markdown: https://insights.sbomify.com/CVE-2020-1993/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-1993
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-1993
- OSV: https://osv.dev/vulnerability/CVE-2020-1993

---
From sbomify Insights: https://insights.sbomify.com/CVE-2020-1993/
Summaries are generated and may contain mistakes; the official description above is the record.