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CVE-2010-0840

Unspecified vulnerability in the Java Runtime Environment component in Oracle Java SE and Java for Business 6 Update 18, 5.0 Update 23, and 1.4.2_25 allows remote attackers to affect confidentiality, integrity, and availability via unknown vectors. NOTE: the previous information was obtained from the March 2010 CPU. Oracle has not commented on claims from a reliable researcher that this is related to improper checks when executing privileged methods in the Java Runtime Environment (JRE), which allows attackers to execute arbitrary code via (1) an untrusted object that extends the trusted class but has not modified a certain method, or (2) "a similar trust issue with interfaces," aka "Trusted Methods Chaining Remote Code Execution Vulnerability."

CVSS
9.8Criticalscored by CISA
Exploited in the wild
Yes, in CISA KEV since 25 May 2022CISA deadline for US federal agencies: 15 Jun 2022public exploit code
EPSS
96.3%chance of exploitation in the next 30 daystop 0.2% of scored CVEsFIRST score of 11 Nov 2026
Fix
Patch availablesee the advisories in the references
Published
1 Apr 2010analysed here 12 Nov 2026

Do first. Apply updates per vendor instructions. (CISA's required action for this KEV entry)

Summary

Triage

Exploitable
At runtime
Attack vector
network
Can a WAF block it?
Partly. See why

The summary, impact and action text on this page are written by our AI analysis pipeline, or taken from the NVD description when a CVE was imported from NVD. They are not the vendor's wording: check them against the sources. A longer AI executive summary and technical analysis are generated for signed-in accounts on the Max plan.

Affected products

Products named in our analysis

  • oracle:jre
  • opensuse:opensuse
  • canonical:ubuntu_linux

Fix and mitigation

WAF and other mitigations

Can a WAF block it? Partly. The bug can be reached over the network, so generic WAF rules may stop some attacks. Its weakness type is unknown, so we cannot be more precise.

Also consider: patch

Based on the weakness type only; no CVE-specific evidence yet. We check Cloudflare, AWS, Google Cloud Armor and Azure; for Akamai, Imperva, Fastly, F5, ask your vendor.

Remediation steps (AI-written)

Step-by-step remediation is generated for accounts on the Max plan, for CVEs that match a technology in their stack. Add this technology to your stack to see the fix checklist.

Exploitation evidence

CISA KEV catalog
Listed since 25 May 2022.
CISA due date
15 Jun 2022, the remediation deadline for US federal agencies
CISA required action
Apply updates per vendor instructions.
Public exploit code
Yes: 1 on Exploit-DB · 1 Metasploit module
CISA SSVC
exploitation active, automatable yes, technical impact totalAssessed by CISA 10 Feb 2025 (SSVC 2.0.3). Exploitation is none, poc (public proof of concept) or active.

Exploit-DB

Metasploit

Listed so you can judge urgency, not as a recommendation to run anything. GitHub “proofs of concept” are unvetted: some are fake or carry malware. Exploit-DB marks the entries its staff verified.

Timeline

  1. 1 Apr 2010Published
  2. 15 Dec 2010First public exploit or proof of concept257 days (about 9 months) later
  3. 25 May 2022Added to CISA KEV (exploited in the wild)4,179 days (about 11 years) later
  4. 15 Jun 2022CISA remediation due date (US federal agencies)21 days later
  5. 10 Feb 2025CISA SSVC assessment: exploitation active972 days (about 3 years) later
  6. 22 Oct 2025CVE record last updated253 days (about 8 months) later
  7. 12 Nov 2026Analysed by vulneraibility.com387 days (about 1 year) later

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

MetricValueWhat it means
Attack vectorNetworkReachable over the internet or any routable network.
Attack complexityLowRepeatable attack, no special conditions.
Privileges requiredNoneThe attacker needs no prior access.
User interactionNoneNo victim action needed.
ScopeUnchangedImpact stays within the vulnerable component.
ConfidentialityHighTotal data disclosure possible.
IntegrityHighComplete modification possible.
AvailabilityHighFull outage possible.

Common questions

Is CVE-2010-0840 being exploited?

Yes. CVE-2010-0840 appears in CISA's Known Exploited Vulnerabilities catalog, which means exploitation in the wild has been confirmed and reported. Treat it as active rather than theoretical, and patch it ahead of higher-scoring vulnerabilities that carry no exploitation evidence.

How severe is CVE-2010-0840?

CVE-2010-0840 is rated Critical with a CVSS score of 9.8. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.

Is there a patch for CVE-2010-0840?

Yes. A fix has been recorded for CVE-2010-0840. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.

What does CVE-2010-0840 affect?

CVE-2010-0840 affects oracle:jre, opensuse:opensuse, canonical:ubuntu_linux. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.

Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.

References

NVDCVE.orgCVE DetailsSource

41 references in the CVE record, grouped by the tags the record gives them.

Advisories (23)

Show 17 more

Other links (18)

Show 12 more

Where the data on this page comes from

Summary, impact and triage tags: written by our AI analysis pipeline from the sources above. Check them against the sources.

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