# CVE-2025-61910: NASA ION-DTN BPv7 4.1.3s Uncontrolled Memory Allocation that leads to Denial-of-Service

> A malformed BPv7 bundle causes uncontrolled memory allocation in NASA ION-DTN, leading to receiver thread termination and denial of service.

- **Severity:** High 7.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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:** 7 Oct 2025
- **Updated:** 7 Oct 2025
- **Also known as:** GHSA-xm96-38vj-h28h

## What is CVE-2025-61910?

CVE-2025-61910 is a high-severity denial of service vulnerability in nasa-jpl ION-DTN, published on 7 Oct 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

The NASA’s Interplanetary Overlay Network (ION) is an implementation of Delay/Disruption Tolerant Networking (DTN). A BPv7 bundle with a malformed extension block causes uncontrolled memory allocation inside ION-DTN 4.1.3s, leading to receiver thread termination and a Denial-of-Service (DoS). The triggering bundle contains an extension block starting at `0x85070201005bbb0e20b4ea001a000927c0...`. The first byte in the extension block (0x85) indicates a CBOR array of five elements of which the first four are numbers (0x07, 0x02, 0x01, 0x00) but the fifth element is a byte string of length 27 (`0x5bbb0e20b4ea001a000927c0...`). The vulnerability seems to be due to processing the fifth element of the array (i.e., the byte string) as replacing it with a number makes the vulnerability no longer be triggered. While parsing this extension block, ION obtains a very large block length, which in the code in `bei.c`:764) seems to be passed from `blockLength` which is an unsigned int, to a 32 bit signed integer `blkSize`. The unsigned to signed conversion causes `blkSize` to hold the value of -369092043, which is then converted into a 64-bit unsigned value inside `MTAKE(blkSize)`, resulting in an attempt to allocate an unrealistic amount of memory, causing the error. As of time of publication, no known patched versions of BPv7 exist.

Weakness: CWE-789 (Memory Allocation with Excessive Size Value)

## Which versions are affected by CVE-2025-61910?


## How do I fix CVE-2025-61910?

No fix has been published for CVE-2025-61910 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-61910 being exploited?

There is no known exploitation of CVE-2025-61910 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-61910 and fix it if it is affected.

What it is: CVE-2025-61910 is a high-severity denial of service vulnerability in nasa-jpl ION-DTN, published on 7 Oct 2025. 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-2025-61910 in the wild and no public exploit code.

Affected product: nasa-jpl ION-DTN. 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-2025-61910/ (Markdown: https://insights.sbomify.com/CVE-2025-61910/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-61910
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-61910
- OSV: https://osv.dev/vulnerability/CVE-2025-61910

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From sbomify Insights: https://insights.sbomify.com/CVE-2025-61910/
Summaries are generated and may contain mistakes; the official description above is the record.