# CVE-2020-9502: Auth bypass in IPC-HX2XXX Series,IPC-HXXX5X4X Series,IPC-HX5842H,IPC-HX7842H,NVR 5x Series,NVR 4x Series,SD6AL Series,SD5A Series,SD1A Series,PTZ1A Series,SD50/52C Series,IPC-HFW1431S

> Attackers can predict session IDs to hijack user sessions on Dahua IP cameras and NVRs, gaining unauthorized access to the devices.

- **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:** 13 May 2020
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-rqmc-r2j8-rwq3

## What is CVE-2020-9502?

CVE-2020-9502 is a critical authentication bypass vulnerability in IPC-HX2XXX Series,IPC-HXXX5X4X Series,IPC-HX5842H,IPC-HX7842H,NVR 5x Series,NVR 4x Series,SD6AL Series,SD5A Series,SD1A Series,PTZ1A Series,SD50/52C Series,IPC-HFW1431S, published on 13 May 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Some Dahua products with Build time before December 2019 have Session ID predictable vulnerabilities. During normal user access, an attacker can use the predicted Session ID to construct a data packet to attack the device.

Weakness: CWE-330 (Use of Insufficiently Random Values)

## Which versions are affected by CVE-2020-9502?

It affects 20 products.


Products: Dahuasecurity Ipc-Hdbw1320e-W Firmware, Dahuasecurity Ipc-Hx2xxx Firmware, Dahuasecurity Ipc-Hx5842h Firmware, Dahuasecurity Ipc-Hx7842h Firmware, Dahuasecurity Ipc-Hxxx5x4x Firmware, Dahuasecurity N42b1p Firmware, Dahuasecurity N42b2p Firmware, Dahuasecurity N42b3p Firmware, Dahuasecurity N52a4p Firmware, Dahuasecurity N52b2p Firmware, Dahuasecurity N52b3p Firmware, Dahuasecurity N52b5p Firmware, Dahuasecurity N54a4p Firmware, Dahuasecurity N54b2p Firmware, Dahuasecurity Ptz1a Firmware, Dahuasecurity Sd1a Firmware, Dahuasecurity Sd50 Firmware, Dahuasecurity Sd52c Firmware, Dahuasecurity Sd5a Firmware, Dahuasecurity Sd6al Firmware.

## How do I fix CVE-2020-9502?

No fix has been published for CVE-2020-9502 yet. Limit exposure of the affected software until one is available.

## Is CVE-2020-9502 being exploited?

There is no known exploitation of CVE-2020-9502 in the wild and no public exploit code.

## Other vulnerabilities in IPC-HX2XXX Series,IPC-HXXX5X4X Series,IPC-HX5842H,IPC-HX7842H,NVR 5x Series,NVR 4x Series,SD6AL Series,SD5A Series,SD1A Series,PTZ1A Series,SD50/52C Series,IPC-HFW1431S

- [CVE-2019-9682](https://insights.sbomify.com/CVE-2019-9682/): Weak cryptography in IPC-HX2XXX Series,IPC-HXXX5X4X Series,IPC-HX5842H,IPC-HX7842H,NVR 5x Series,NVR 4x Series,SD6AL Series,SD5A Series,SD1A Series,PTZ1A Series,SD50/52C Series,IPC-HDBW1320E-W (high 8.1)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-9502 and fix it if it is affected.

What it is: CVE-2020-9502 is a critical authentication bypass vulnerability in IPC-HX2XXX Series,IPC-HXXX5X4X Series,IPC-HX5842H,IPC-HX7842H,NVR 5x Series,NVR 4x Series,SD6AL Series,SD5A Series,SD1A Series,PTZ1A Series,SD50/52C Series,IPC-HFW1431S, published on 13 May 2020. 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-2020-9502 in the wild and no public exploit code.

Affected product: IPC-HX2XXX Series,IPC-HXXX5X4X Series,IPC-HX5842H,IPC-HX7842H,NVR 5x Series,NVR 4x Series,SD6AL Series,SD5A Series,SD1A Series,PTZ1A Series,SD50/52C Series,IPC-HFW1431S. 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-2020-9502/ (Markdown: https://insights.sbomify.com/CVE-2020-9502/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-9502
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-9502
- OSV: https://osv.dev/vulnerability/CVE-2020-9502

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From sbomify Insights: https://insights.sbomify.com/CVE-2020-9502/
Summaries are generated and may contain mistakes; the official description above is the record.