# CVE-2018-1000654: Denial of service in n/a

> Attackers can cause a denial of service by providing a crafted file that triggers excessive CPU usage in the ASN.1 parser.

- **Severity:** Medium 5.5 (`CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** A user has to click or open something
- **Fix available:** Yes
- **Published:** 20 Aug 2018
- **Updated:** 5 Aug 2024
- **Also known as:** ALPINE-CVE-2018-1000654, DEBIAN-CVE-2018-1000654, GHSA-g69v-w5wh-rhwv, MGASA-2019-0359, SUSE-SU-2019:1372-1, SUSE-SU-2019:1372-2, UBUNTU-CVE-2018-1000654, USN-5352-1, openSUSE-SU-2019:1498-1

## What is CVE-2018-1000654?

CVE-2018-1000654 is a medium-severity denial of service vulnerability in n/a, published on 20 Aug 2018. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.

### Official description

GNU Libtasn1-4.13 libtasn1-4.13 version libtasn1-4.13, libtasn1-4.12 contains a DoS, specifically CPU usage will reach 100% when running asn1Paser against the POC due to an issue in _asn1_expand_object_id(p_tree), after a long time, the program will be killed. This attack appears to be exploitable via parsing a crafted file.

## Which versions are affected by CVE-2018-1000654?

It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `libtasn1` | SUSE:Linux Enterprise Module for Basesystem 15 | All versions | 4.13-4.5.1 |
| `libtasn1` | SUSE:Linux Enterprise Module for Basesystem 15 SP1 | All versions | 4.13-4.5.1 |
| `libtasn1` | SUSE:Linux Enterprise Module for Desktop Applications 15 | All versions | 4.13-4.5.1 |
| `libtasn1` | openSUSE:Leap 15.0 | All versions | 4.13-lp151.4.3.1 |
| `libtasn1` | openSUSE:Leap 15.1 | All versions | 4.13-lp151.4.3.1 |

Products: Gnu Libtasn1.

## How do I fix CVE-2018-1000654?

Apply the vendor's patch.

## Is CVE-2018-1000654 being exploited?

There is no known exploitation of CVE-2018-1000654 in the wild and no public exploit code.

## Other vulnerabilities in n/a

- [CVE-2025-13151](https://insights.sbomify.com/CVE-2025-13151/): CVE-2025-13151 (high 7.5)
- [CVE-2017-10790](https://insights.sbomify.com/CVE-2017-10790/): Null dereference in n/a (high 7.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2018-1000654 and fix it if it is affected.

What it is: CVE-2018-1000654 is a medium-severity denial of service vulnerability in n/a, published on 20 Aug 2018. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2018-1000654 in the wild and no public exploit code.

Affected product: n/a. 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-2018-1000654/ (Markdown: https://insights.sbomify.com/CVE-2018-1000654/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2018-1000654
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2018-1000654
- OSV: https://osv.dev/vulnerability/CVE-2018-1000654

---
From sbomify Insights: https://insights.sbomify.com/CVE-2018-1000654/
Summaries are generated and may contain mistakes; the official description above is the record.