# CVE-2010-3495: Zope Object Database Denial of Service vulnerability

> Remote attackers can cause a denial of service in ZODB by exploiting a race condition during TCP connection handling, crashing the daemon.

- **Severity:** Medium 4.3 (`AV:N/AC:M/Au:N/C:N/I:N/A:P`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 19 Oct 2010
- **Updated:** 7 Aug 2024
- **Also known as:** GHSA-j6m4-frxh-p4x8, PYSEC-2010-27

## What is CVE-2010-3495?

CVE-2010-3495 is a medium-severity vulnerability in n/a, published on 19 Oct 2010. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Race condition in ZEO/StorageServer.py in Zope Object Database (ZODB) before 3.10.0 allows remote attackers to cause a denial of service (daemon outage) by establishing and then immediately closing a TCP connection, leading to the accept function having an unexpected return value of None, an unexpected value of None for the address, or an ECONNABORTED, EAGAIN, or EWOULDBLOCK error, a related issue to CVE-2010-3492.

Weakness: CWE-362 (Concurrent Execution using Shared Resource with Improper Synchronization)

## Which versions are affected by CVE-2010-3495?

3 open source packages ship an affected version, including zodb3. It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `zodb3` | PyPI | All versions | 3.10.0a1 |
| `zodb3` | PyPI | All versions | 3.10.0a2 |
| `zodb3` | PyPI | All versions | 3.10.0a2 |

Products: Zope Zodb.

## How do I fix CVE-2010-3495?

Upgrade zodb3 to a fixed version for your release line: 3.10.0a1 or 3.10.0a2.

## Is CVE-2010-3495 being exploited?

There is no known exploitation of CVE-2010-3495 in the wild and no public exploit code.

## Other vulnerabilities in n/a

- [CVE-2009-0669](https://insights.sbomify.com/CVE-2009-0669/): Zope Object Database (ZODB) Authentication bypass in ZEO storage servers (high 7.5)
- [CVE-2009-0668](https://insights.sbomify.com/CVE-2009-0668/): Zope Object Database (ZODB) vulnerable to arbitrary Python code execution in ZEO storage servers (medium 6.5)
- [CVE-2009-2701](https://insights.sbomify.com/CVE-2009-2701/): Zope Object Database (ZODB) Arbitrary files reading and deletion (medium 6.0)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2010-3495 and fix it if it is affected.

What it is: CVE-2010-3495 is a medium-severity vulnerability in n/a, published on 19 Oct 2010. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2010-3495 in the wild and no public exploit code.

Affected packages and fixed versions:
- zodb3 (PyPI): affected all versions; fixed in 3.10.0a1
- zodb3 (PyPI): affected all versions; fixed in 3.10.0a2
- zodb3 (PyPI): affected all versions; fixed in 3.10.0a2

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-2010-3495/ (Markdown: https://insights.sbomify.com/CVE-2010-3495/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2010-3495
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2010-3495
- OSV: https://osv.dev/vulnerability/CVE-2010-3495

---
From sbomify Insights: https://insights.sbomify.com/CVE-2010-3495/
Summaries are generated and may contain mistakes; the official description above is the record.