CVE-2021-35564Network attack vector

Keystore corruption via unchecked certificate validity

Published Oct 20, 2021 · Updated Aug 4, 2024

Integer overflow in affected Java SE and GraalVM Keytool releases allows remote attackers to corrupt accessible keystores via crafted validity data. The certificate-validity calculation accepts an excessive period and computes an end date beyond year 9999 instead of rejecting it, damaging keystore integrity. Exposure requires untrusted sandboxed Java code or an application, such as a web service, that passes attacker-controlled data to Keytool APIs.

CVSS severity5.3
Medium
EPSS probability5.63%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Integer overflow in affected Java SE and GraalVM Keytool releases allows remote attackers to corrupt accessible keystores via crafted validity data. The certificate-validity calculation accepts an excessive period and computes an end date beyond year 9999 instead of rejecting it, damaging keystore integrity. Exposure requires untrusted sandboxed Java code or an application, such as a web service, that passes attacker-controlled data to Keytool APIs.

The record

CVE
CVE-2021-35564
Published
Oct 20, 2021
Updated
Aug 4, 2024
Vendor
Debian
Product
Debian GNU/Linux
Classifications
CWE-20, T1565.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 20, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=10.0
  2. Affected versionversion=11.0
  3. Affected versionversion=9.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Debian · Debian GNU/Linuxversion=10.0; version=11.0; version=9.0
Fedora Project · Fedora Linuxversion=33; version=34; version=35
NetApp · OnCommand Insightversion=0
Oracle · Oracle GraalVM for JDKversion=20.3.3; version=21.2.0
Oracle Corporation · Java Platform, Standard Edition (Java SE)version=Java SE:11.0.12; version=Java SE:17; version=Java SE:7u311; version=Java SE:8u301; version=Oracle GraalVM Enterprise Edition:20.3.3; version=Oracle GraalVM Enterprise Edition:21.2.0
Oracle · OpenJDKversion=11.0.12; version=17; version=7; version=8

Published CVSS scores

5.3Red HatCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
5.3OracleCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
5.3NetAppCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-20Improper Input Validation
T1565.001Stored Data Manipulation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo