CVE-2023-33199: malformed proposed intoto v0.0.2 entries can cause a panic in Rekor
CVE-2023-33199 is a vulnerability in malformed proposed intoto v0.0.2 entries can cause a panic in Rekor, rated Moderate by Microsoft, with a CVSS 3.1 base score of 5.3 (Medium). An attacker can exploit it remotely over the network, without any privileges and without user interaction. Microsoft has not reported exploitation in the wild. The EPSS model estimates a 0.67% probability of exploitation activity in the next 30 days, higher than 52% of all scored vulnerabilities. Microsoft released the fix on 30 May 2023, outside Patch Tuesday. It affects 1 product in 1 product family (Mariner).
Key facts
- CVE ID
- CVE-2023-33199
- Severity
- Medium CVSS 5.3
- Microsoft severity
- Moderate
- Exploited in the wild
- No
- Publicly disclosed
- No
- Weakness
- CWE-617
- EPSS
- 0.67% (percentile 52%)
- CISA KEV
- Not listed
- Released
- Last updated
- Patch Tuesday
- May 2023 Patch Tuesday
- Product families
- Mariner
CVSS score and vector
Microsoft scores CVE-2023-33199 at 5.3 (temporal 5.3) using CVSS 3.1. Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
| Metric | Value |
|---|---|
| Attack vector | Network |
| Attack complexity | Low |
| Privileges required | None |
| User interaction | None |
| Scope | Unchanged |
| Confidentiality impact | None |
| Integrity impact | None |
| Availability impact | Low |
Frequently asked questions (Microsoft)
Is Azure Linux the only Microsoft product that includes this open-source library and is therefore potentially affected by this vulnerability?
One of the main benefits to our customers who choose to use the Azure Linux distro is the commitment to keep it up to date with the most recent and most secure versions of the open source libraries with which the distro is composed. Microsoft is committed to transparency in this work which is why we began publishing CSAF/VEX in October 2025. See this blog post for more information. If impact to additional products is identified, we will update the CVE to reflect this.
Affected products (1)
Mariner
| Product | Security update | Type | Fixed build | Restart |
|---|---|---|---|---|
| cbl2 skopeo 1.12.0-3 on CBL Mariner 2.0 | CBL-Mariner Releases | Security Update | 1.12.0-3 | No |
NIST NVD data
- NVD status
- Modified
- NVD CVSS
- 5.3 (MEDIUM)
- NVD weakness
- CWE-617
- Published to NVD
- NVD last modified
Affected configurations (CPE)
| Product | Vulnerable versions |
|---|---|
| rekor | before 1.2.0 |
References
- https://github.com/sigstore/rekor/commit/140c5add105179e5ffd9e3e114fd1b6b93aebbd4 (Patch)
- https://github.com/sigstore/rekor/security/advisories/GHSA-frqx-jfcm-6jjr (Vendor Advisory)
- https://github.com/sigstore/rekor/commit/140c5add105179e5ffd9e3e114fd1b6b93aebbd4 (Patch)
- https://github.com/sigstore/rekor/security/advisories/GHSA-frqx-jfcm-6jjr (Vendor Advisory)
Revision history
| Version | Date | Description |
|---|---|---|
| 1.0 | Information published. |