XXE in Sap Netweaver Application Server For Java
CVE-2021-27635
SAP NetWeaver AS for JAVA, versions - 7.20, 7.30, 7.31, 7.40, 7.50, allows an attacker authenticated as an administrator to connect over a network and submit a specially crafted XML file in the application because of missing XML Validation, this vulnerability enables attacker to fully compromise confidentiality by allowing them to read any file on the filesystem or fully compromise availability by causing the system to crash. The attack cannot be used to change any data so that there is no compromise as to integrity.
Vulnerability class: XXE (XML External Entity)
EPSS: 0.016 (73.2th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:H.
Affected products
- Sap Netweaver_application_server_for_java — versions 7.20, 7.30, 7.31
- Sap Se Netweaver As For Java — versions < 7.20, < 7.30, < 7.31
Weakness classification (CWE)
Public proof-of-concept exploits
References
- cna@sap.com (x_refsource_MISC, Vendor Advisory)
- cna@sap.com (Permissions Required, x_refsource_MISC, Vendor Advisory)
- cna@sap.com (mailing-list, Patch, x_refsource_FULLDISC, Mailing List, Third Party Advisory)
- cna@sap.com (Patch, VDB Entry, Third Party Advisory, x_refsource_MISC)
Frequently asked questions
- What is CVE-2021-27635?
- CVE-2021-27635 is a medium-severity vulnerability in Sap Netweaver Application Server For Java, classified under Improper Restriction of XML External Entity Reference (XXE). CVSS score: 6.5/10. Published 2021-06-09.
- How severe is CVE-2021-27635?
- Medium severity. CVSS v3 base score is 6.5 out of 10.
- Is CVE-2021-27635 known to be exploited?
- 3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.