CVE-2021-30137 json
Assyst 10 SP7.5 has authenticated XXE leading to SSRF via XML unmarshalling.
published 2021-09-15 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-17074
- cvss
- 7.7
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.7%
- EPSS 0.7% chance of exploitation in 30 days, percentile 53%
- public exploits
- 0
- none known
Summary
Assyst 10 SP7.5 has authenticated XXE leading to SSRF via XML unmarshalling. The application allows users to send JSON or XML data to the server. It was possible to inject malicious XML data through several access points.
Exploit prediction
0.71% chance of exploitation in the next 30 days, higher than 53% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- github.com https://github.com/post-cyberlabs/CVE-Advisory/blob/main/CVE-2021-30137.pdf referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 7.7 | CVSS:3.1/AC:H/AV:N/A:H/C:L/I:L/PR:L/S:C/UI:N |
| CNA | 3.1 | 7.7 | CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:L/A:H |
| NVD | 3.1 | 8.2 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H |
| NVD | 2.0 | 6.4 | AV:N/AC:L/Au:N/C:P/I:N/A:P |
Classification
- Weakness
-
- CWE-611 Improper Restriction of XML External Entity Reference
References
-
github.com
/post-cyberlabs/CVE-Advisory/blob/main/CVE-2021-30137.pdf
exploit, third-party-advisory
Sources
- CVE List CVE-2021-30137
- NVD CVE-2021-30137
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.