# CVE-2021-3287: Deserialization in n/a

> Unauthenticated attackers can execute arbitrary code on Zoho ManageEngine OpManager servers due to a deserialization bypass.

- **Severity:** Critical 9.8 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 22 Apr 2021
- **Updated:** 3 Aug 2024
- **Also known as:** GHSA-9342-c88m-74xw

## What is CVE-2021-3287?

CVE-2021-3287 is a critical unsafe deserialization vulnerability in Zohocorp Manageengine Opmanager, published on 22 Apr 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Zoho ManageEngine OpManager before 12.5.329 allows unauthenticated Remote Code Execution due to a general bypass in the deserialization class.

Weakness: CWE-502 (Deserialization of Untrusted Data)

## Which versions are affected by CVE-2021-3287?

It affects 1 product.


Products: Zohocorp Manageengine Opmanager.

## How do I fix CVE-2021-3287?

No fix has been published for CVE-2021-3287 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-3287 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2021-3287 exists.

Public exploit code:

- ManageEngine OpManager SumPDU Java Deserialization (metasploit)
- Zoho ManageEngine OpManager < 12.5.329 - Remote Code Execution (nuclei): http/cves/2021/CVE-2021-3287.yaml

## Other vulnerabilities in Zohocorp Manageengine Opmanager

- [CVE-2022-29535](https://insights.sbomify.com/CVE-2022-29535/): SQL injection in n/a (critical 9.8)
- [CVE-2021-44514](https://insights.sbomify.com/CVE-2021-44514/): Auth bypass in n/a (critical 9.8)
- [CVE-2021-40493](https://insights.sbomify.com/CVE-2021-40493/): SQL injection in n/a (critical 9.8)
- [CVE-2021-41075](https://insights.sbomify.com/CVE-2021-41075/): SQL injection in n/a (critical 9.8)
- [CVE-2021-41288](https://insights.sbomify.com/CVE-2021-41288/): SQL injection in n/a (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-3287 and fix it if it is affected.

What it is: CVE-2021-3287 is a critical unsafe deserialization vulnerability in Zohocorp Manageengine Opmanager, published on 22 Apr 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2021-3287 exists.

Affected product: Zohocorp Manageengine Opmanager. 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-2021-3287/ (Markdown: https://insights.sbomify.com/CVE-2021-3287/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-3287
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-3287
- OSV: https://osv.dev/vulnerability/CVE-2021-3287

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-3287/
Summaries are generated and may contain mistakes; the official description above is the record.