# CVE-2020-27651: Information disclosure in Synology Router Manager (SRM)

> Attackers can intercept session cookies due to missing Secure flags, potentially leading to account takeover on Synology routers.

- **Severity:** Medium 5.8 (`CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:L`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 29 Oct 2020
- **Updated:** 16 Sep 2024
- **Also known as:** GHSA-mxhv-mc3x-7jmr

## What is CVE-2020-27651?

CVE-2020-27651 is a medium-severity vulnerability in Synology Router Manager, published on 29 Oct 2020. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### Official description

Synology Router Manager (SRM) before 1.2.4-8081 does not set the Secure flag for the session cookie in an HTTPS session, which makes it easier for remote attackers to capture this cookie by intercepting its transmission within an HTTP session.

Weakness: CWE-311 (Missing Encryption of Sensitive Data), CWE-614 (Sensitive Cookie in HTTPS Session Without 'Secure' Attribute)

## Which versions are affected by CVE-2020-27651?

It affects 1 product.


Products: Synology Router Manager.

## How do I fix CVE-2020-27651?

No fix has been published for CVE-2020-27651 yet. Limit exposure of the affected software until one is available.

## Is CVE-2020-27651 being exploited?

There is no known exploitation of CVE-2020-27651 in the wild and no public exploit code.

## Other vulnerabilities in Synology Router Manager

- [CVE-2023-32956](https://insights.sbomify.com/CVE-2023-32956/): Command injection in Synology Router Manager (SRM) (critical 9.8)
- [CVE-2020-27654](https://insights.sbomify.com/CVE-2020-27654/): Command injection in Synology Router Manager (SRM) (critical 9.8)
- [CVE-2019-11823](https://insights.sbomify.com/CVE-2019-11823/): Denial of service in Synology Router Manager (SRM) (high 8.6)
- [CVE-2020-27649](https://insights.sbomify.com/CVE-2020-27649/): Security feature bypass in Synology Router Manager (SRM) (high 8.3)
- [CVE-2024-11398](https://insights.sbomify.com/CVE-2024-11398/): Path traversal in Synology Router Manager (SRM) (high 8.1)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2020-27651 and fix it if it is affected.

What it is: CVE-2020-27651 is a medium-severity vulnerability in Synology Router Manager, published on 29 Oct 2020. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2020-27651 in the wild and no public exploit code.

Affected product: Synology Router Manager. 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-2020-27651/ (Markdown: https://insights.sbomify.com/CVE-2020-27651/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-27651
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-27651
- OSV: https://osv.dev/vulnerability/CVE-2020-27651

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From sbomify Insights: https://insights.sbomify.com/CVE-2020-27651/
Summaries are generated and may contain mistakes; the official description above is the record.