🛡️ CVE-2021-28170 — el-ri

⚪ Unknown ✅ No Known Exploit CWE-20 OSV
N/A
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

Improper Input Validation in Jakarta Expression Language

In the Jakarta Expression Language implementation 3.0.3 and earlier, a bug in the ELParserTokenManager enables invalid EL expressions to be evaluated as if they were valid.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs no privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality none, integrity low, availability none.

Weakness class

CVE-2021-28170 is classified as CWE-20: Improper Input Validation. The application accepts input without checking that it has the expected form, so malformed values reach code that assumes they are well formed.

Affected software

CVE-2021-28170 is recorded against 3 packages.

  • com.sun.el:el-ri (fixed in 3.0.4)
  • org.glassfish:jakarta.el (fixed in 3.0.4)
  • org.glassfish:javax.el

Timeline and source

Published on 6 October 2021 and last revised on 1 July 2025. No public exploit is currently recorded for this entry. Record sourced from OSV.

References

nvd.nist.gov (Advisory)
github.com (Web)
github.com (Web)
github.com (Package)
security.snyk.io (Web)
security.snyk.io (Web)
securitylab.github.com (Advisory)
www.oracle.com (Web)

Details

Severity Unknown
CVSS Score N/A
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
CWE CWE-20
Public Exploit ✅ No
Source OSV
Published 2021-10-06
Updated 2026-08-12
Modified 2025-07-01
Fix URL N/A

Affected Packages

Software From version Fixed in
com.sun.el:el-ri — 3.0.4
org.glassfish:jakarta.el — 3.0.4
org.glassfish:javax.el — —

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