BlackTreeCVE Intelligence
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Full vulnerability report · 2023
CVE-2023-3635High confidence

Okio GzipSource unhandled exception Denial of Service

Unknown · Unknown

5.9MediumCVSS 3.1
Recommended action
Within 7 days

Medium technical severity with public exploit material referenced by a structured source; prioritise exposed affected systems while verifying vendor guidance.

Patch available
R
Operational reassessment

Published severity in operational context

Open reassessment dashboard →
Published severityMediumOperational priority:High, raised one band.upgradedsince 23 Oct 2024

Evidence used

  • No CISA KEV confirmation is currently recorded.
  • A structured source references public exploit or proof-of-concept material.
  • The selected CVSS metric records a network-reachable, unauthenticated path with no user interaction.
  • EPSS is 1.25% for the current model date.

Compensating controls

  • Validate the affected product branch and deploy the verified fixed release.
  • Restrict the affected network interface to trusted sources where business-safe.
  • Increase monitoring for the attack path and post-exploitation behaviour described in the report.

Verification

  1. Confirm that the asset runs Unknown Unknown and falls inside the recorded affected range.
  2. Verify the installed build against the product-specific fixed version after deployment.
  3. Validate exposure, authentication requirements and compensating controls in the actual environment.
  4. Reopen this reassessment when CVSS, KEV, EPSS, exploit evidence or remediation changes.
Mitigation target: Within 30 daysRemediation target: Within 180 days

This automated reassessment organises public evidence. It does not know asset exposure, business impact or control effectiveness and does not replace CVSS or a human risk decision.

Distribution package intelligence

Release-specific package status

Debian, ubuntu findings are scoped to the named distribution, release and source package. An absent finding does not mean a package is unaffected.

5 package states
Repository candidate not checked

A published vendor fix does not prove that a matching update is enabled and installable on a particular asset. Confirm the local package candidate before scheduling remediation.

Distribution releaseSource packageVendor stateFixed versionEvidence
Debian trixietrixie · sourceokioNot affectedDebian marks this release not affected (fixed-version marker 0).Not published in this feedDebian Security Tracker ↗Source updated 6 Oct 2026
Debian bookwormbookworm · sourceokioNot affectedDebian marks this release not affected (fixed-version marker 0).Not published in this feedDebian Security Tracker ↗Source updated 6 Oct 2026
Debian forkyforky · sourceokioNot affectedDebian marks this release not affected (fixed-version marker 0).Not published in this feedDebian Security Tracker ↗Source updated 6 Oct 2026
Debian sidsid · sourceokioNot affectedDebian marks this release not affected (fixed-version marker 0).Not published in this feedDebian Security Tracker ↗Source updated 6 Oct 2026
Ubuntu 24.04 LTSnoble · standard archiveokioUnder evaluationCanonical reports that the package might be affected and still needs evaluation or fixing.Not published in this feedCanonical Ubuntu Security ↗Source updated 5 Oct 2026
Open-source package ranges3 source-attributed ranges

These OSV and GitHub advisory ranges apply only to the named package and ecosystem. A listed fixed version is not a universal product patch or proof that an update is installed.

Ecosystem and packageAffected rangeFirst fixed versionEvidence
Mavencom.squareup.okio:okioECOSYSTEM: introduced 2.0.0-RC1; fixed 3.4.03.4.0OSV record ↗aggregator derived · 10 Sep 2026
Mavencom.squareup.okio:okioECOSYSTEM: introduced 0; fixed 1.17.61.17.6OSV record ↗aggregator derived · 10 Sep 2026
Mavencom.squareup.okio:okio-jvmECOSYSTEM: introduced 2.0.0-RC1; fixed 3.4.03.4.0OSV record ↗aggregator derived · 10 Sep 2026
Optional official sources

National CERT insights
?CERT means Computer Emergency Response Team; CSIRT is the closely related term Computer Security Incident Response Team.

Choose official national sources for this report. Each advisory shows its original language. Your selection is remembered on this device and included in shared links.

Official European source

ENISA European Vulnerability Database

Official EUVD identifiers, advisory evidence and known-exploited context. Missing fields are not treated as evidence of low risk.

1 current
ENISA EUVD identifier

EUVD-2023-2158

No EUVD known-exploited evidence

ENISA has published the identifier mapping but no EUVD description has been stored yet.

EUVD state
Present in the current official mapping
Known exploitation
Not present in the current ENISA EUVD known-exploited dataset. This is not proof of no exploitation.
ENISA score
Not supplied in the stored EUVD record
Advisory evidence
No linked advisory details stored yet
Recommended actionWithin 7 days

Medium technical severity with public exploit material referenced by a structured source; prioritise exposed affected systems while verifying vendor guidance.

Patch available
01

What, why and how

GzipSource does not handle an exception that might be raised when parsing a malformed gzip buffer. This may lead to denial of service of the Okio client when handling a crafted GZIP archive, by using the GzipSource class.

What

GzipSource does not handle an exception that might be raised when parsing a malformed gzip buffer. This may lead to denial of service of the Okio client when handling a crafted GZIP archive, by using the GzipSource class.

Why

The product uses a signed primitive and performs a cast to an unsigned primitive, which can produce an unexpected value if the value of the signed primitive can not be represented using an unsigned primitive.

How

An attacker operating through a network path may attempt exploitation without authentication or user interaction. If successful, the issue may disrupt the affected service.

What

GzipSource does not handle an exception that might be raised when parsing a malformed gzip buffer. This may lead to denial of service of the Okio client when handling a crafted GZIP archive, by using the GzipSource class.

Why

The product uses a signed primitive and performs a cast to an unsigned primitive, which can produce an unexpected value if the value of the signed primitive can not be represented using an unsigned primitive.

How

An attacker operating through a network path may attempt exploitation without authentication or user interaction. If successful, the issue may disrupt the affected service.

02

Exploit reality and attack path

CVSS severity, EPSS forecast probability, public exploit material and CISA-confirmed exploitation are separate signals.

Observed exploitation
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
No confirmed evidence

No CISA KEV match was present at the last successful refresh. This means no confirmation from that source, not proof of no exploitation.

Public PoC / exploit material
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
Reference recorded

A structured CVE source labels at least one public reference as exploit material. BlackTree has not independently validated that it is safe, reliable or weaponised.

Likely attack path
a network path → Signed to Unsigned Conversion Error → disrupt the affected service
Attack surface
Network
Privileges required
None: unauthenticated exploitation is possible
User interaction
None
Attack complexity
High: exploitation depends on specific conditions
Security boundary
Unchanged: impact remains within the vulnerable component's security authority
Weakness
?CWE means Common Weakness Enumeration: a standard category for the underlying weakness.
CWE-195 ↗

CWE-195: Signed to Unsigned Conversion Error. The product uses a signed primitive and performs a cast to an unsigned primitive, which can produce an unexpected value if the value of the signed primitive can not be represented using an unsigned primitive.

CVSS vector
?CVSS means Common Vulnerability Scoring System. The vector records the metric values used to calculate technical severity.
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Common Vulnerability Scoring System 3.1: the compact vector below is decoded into plain language.

AVNetworkAttack vector: The vulnerable component can be reached over a network.ACHighAttack complexity: Successful exploitation depends on specific conditions outside the attacker's direct control.PRNonePrivileges required: The attacker does not need an account or existing privileges.UINoneUser interaction: No action by another user is required.SUnchangedScope: The security impact remains within the vulnerable component's authority.CNoneConfidentiality impact: No direct loss is represented by this metric.INoneIntegrity impact: No direct loss is represented by this metric.AHighAvailability impact: A successful attack can cause a major loss.
Post-exploitation / living off the land
No specific living-off-the-land technique is confirmed in the structured sources. Monitor normal administration tools for activity inconsistent with the affected service's baseline.
NetworkUnauthenticatedDenial of serviceCWE-195Public exploit reference
A

Official authority intelligence

Only matched European and national findings are included. Language selectors and unavailable sources are omitted.

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Official advisory ↗
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Official advisory ↗
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Ein entfernter, anonymer Angreifer kann mehrere Schwachstellen in Oracle Fusion Middleware ausnutzen, um die Vertraulichkeit, Integrität und Verfügbarkeit zu gefährden.

Official advisory ↗
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Ein Angreifer kann mehrere Schwachstellen in Dell ECS ausnutzen, um seine Privilegien zu erweitern, beliebigen Programmcode mit Administratorrechten auszuführen, Informationen offenzulegen, Dateien zu manipulieren, einen Cross-Site-Scripting-Angriff durchzuführen, Sicherheitsvorkehrungen zu umgehen oder einen Denial of Service Zustand herbeizuführen.

Official advisory ↗
BSI · German · WID-SEC-2024-0123Oracle Fusion Middleware: Mehrere Schwachstellen

Ein entfernter, anonymer oder authentisierter Angreifer kann mehrere Schwachstellen in Oracle Fusion Middleware ausnutzen, um die Vertraulichkeit, Integrität und Verfügbarkeit zu gefährden.

Official advisory ↗
BSI · German · WID-SEC-2023-2679Oracle Communications: Mehrere Schwachstellen

Ein entfernter, anonymer oder authentisierter Angreifer kann mehrere Schwachstellen in Oracle Communications ausnutzen, um die Vertraulichkeit, Integrität und Verfügbarkeit zu gefährden.

Official advisory ↗
BSI · German · WID-SEC-2023-2858IBM Security Guardium: Mehrere Schwachstellen ermöglichen Denial of Service

Ein entfernter, anonymer Angreifer kann mehrere Schwachstellen in IBM Security Guardium ausnutzen, um einen Denial of Service Angriff durchzuführen.

Official advisory ↗
BSI · German · WID-SEC-2023-2724IBM Integration Bus: Mehrere Schwachstellen ermöglichen Denial of Service

Ein entfernter, anonymer Angreifer kann mehrere Schwachstellen in IBM Integration Bus ausnutzen, um einen Denial of Service Angriff durchzuführen.

Official advisory ↗
Cyber Security Agency of Singapore · English · CSA-SB-20230719Security Bulletin 19 Jul 2023

The Cyber Security Agency of Singapore included this CVE in its official Security Bulletin 19 Jul 2023, published on 19 July 2023. Open the linked bulletin for the product, severity and reference information published in that issue.

Official advisory ↗
CERT-FR · French · CERTFR-2026-AVI-1165Multiples vulnérabilités dans les produits IBM

ord?id=CVE-2023-29267 Référence CVE CVE-2023-2976 https://www.cve.org/CVERecord?id=CVE-2023-2976 Référence CVE CVE-2023-33201 https://www.cve.org/CVERecord?id=CVE-2023-33201 Référence CVE CVE-2023-34453 https://www.cve.org/CVERecord?id=CVE-2023-34453 Référence CVE CVE-2023-34454 https://www.cve.org/CVERecord?id=CVE-2023-34454 Référence CVE CVE-2023-34455 https://www.cve.org/CVERecord?id=CVE-2023-34455 Référence CVE CVE-2023-34462 https://www.cve.org/CVERecord?id=CVE-2023-34462 Référence CVE CVE-2023-34610 https://www.cve.org/CVERecord?id=CVE-2023-34610 Référence CVE CVE-2023-35701 https://www.cve.org/CVERecord?id=CVE-2023-35701 Référence CVE CVE-2023-3635 https://www.cve.org/CVERecord?id=CVE-2023-3635 Référence CVE CVE-2023-36478 https://www.cve.org/CVERecord?id=CVE-2023-36478 Référence CVE CVE-2023-36479 https://www.cve.org/CVERecord?id=CVE-2023-36479 Référence CVE CVE-2023-39410 https://www.cve.org/CVERecord?id=CVE-2023-39410 Référence CVE CVE-2023-40167 https://www.cve.org/CVERecord?id=CVE-2023-40167 Référence CVE CVE-2023-43642 https://www.cve.org/CVERecord?id=CVE-2023-43642 Référence CVE CVE-2023-44487 https://www.cve.org/CVERecord?id=CVE-2023-44487 Référence CVE CVE-2023-44981 https://www.cve.org/CVERecord?id=CVE-2023-44981 Référence CVE CVE-2023-45178 https://www.cve.org/CVERecord?id=C

Official advisory ↗
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Official advisory ↗
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Official advisory ↗
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Official advisory ↗
CERT-FR · French · CERTFR-2025-AVI-0661Multiples vulnérabilités dans les produits Splunk

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Official advisory ↗
CERT-FR · French · CERTFR-2024-AVI-0741Multiples vulnérabilités dans Juniper Secure Analytics

ord?id=CVE-2022-48624 Référence CVE CVE-2022-48627 https://www.cve.org/CVERecord?id=CVE-2022-48627 Référence CVE CVE-2022-48669 https://www.cve.org/CVERecord?id=CVE-2022-48669 Référence CVE CVE-2023-25193 https://www.cve.org/CVERecord?id=CVE-2023-25193 Référence CVE CVE-2023-29409 https://www.cve.org/CVERecord?id=CVE-2023-29409 Référence CVE CVE-2023-29483 https://www.cve.org/CVERecord?id=CVE-2023-29483 Référence CVE CVE-2023-2953 https://www.cve.org/CVERecord?id=CVE-2023-2953 Référence CVE CVE-2023-31122 https://www.cve.org/CVERecord?id=CVE-2023-31122 Référence CVE CVE-2023-31484 https://www.cve.org/CVERecord?id=CVE-2023-31484 Référence CVE CVE-2023-3635 https://www.cve.org/CVERecord?id=CVE-2023-3635 Référence CVE CVE-2023-38264 https://www.cve.org/CVERecord?id=CVE-2023-38264 Référence CVE CVE-2023-39318 https://www.cve.org/CVERecord?id=CVE-2023-39318 Référence CVE CVE-2023-39319 https://www.cve.org/CVERecord?id=CVE-2023-39319 Référence CVE CVE-2023-39321 https://www.cve.org/CVERecord?id=CVE-2023-39321 Référence CVE CVE-2023-39322 https://www.cve.org/CVERecord?id=CVE-2023-39322 Référence CVE CVE-2023-39326 https://www.cve.org/CVERecord?id=CVE-2023-39326 Référence CVE CVE-2023-43788 https://www.cve.org/CVERecord?id=CVE-2023-43788 Référence CVE CVE-2023-43789 https://www.cve.org/CVERecord?id=C

Official advisory ↗
CERT-FR · French · CERTFR-2024-AVI-0579Multiples vulnérabilités dans les produits IBM

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Official advisory ↗
CERT-FR · French · CERTFR-2024-AVI-0419Multiples vulnérabilités dans les produits IBM

d?id=CVE-2023-26159 Référence CVE CVE-2023-26464 https://www.cve.org/CVERecord?id=CVE-2023-26464 Référence CVE CVE-2023-31486 https://www.cve.org/CVERecord?id=CVE-2023-31486 Référence CVE CVE-2023-31582 https://www.cve.org/CVERecord?id=CVE-2023-31582 Référence CVE CVE-2023-33850 https://www.cve.org/CVERecord?id=CVE-2023-33850 Référence CVE CVE-2023-34453 https://www.cve.org/CVERecord?id=CVE-2023-34453 Référence CVE CVE-2023-34454 https://www.cve.org/CVERecord?id=CVE-2023-34454 Référence CVE CVE-2023-34455 https://www.cve.org/CVERecord?id=CVE-2023-34455 Référence CVE CVE-2023-34462 https://www.cve.org/CVERecord?id=CVE-2023-34462 Référence CVE CVE-2023-3635 https://www.cve.org/CVERecord?id=CVE-2023-3635 Référence CVE CVE-2023-41419 https://www.cve.org/CVERecord?id=CVE-2023-41419 Référence CVE CVE-2023-44981 https://www.cve.org/CVERecord?id=CVE-2023-44981 Référence CVE CVE-2023-46234 https://www.cve.org/CVERecord?id=CVE-2023-46234 Référence CVE CVE-2023-51775 https://www.cve.org/CVERecord?id=CVE-2023-51775 Référence CVE CVE-2023-6378 https://www.cve.org/CVERecord?id=CVE-2023-6378 Référence CVE CVE-2023-6481 https://www.cve.org/CVERecord?id=CVE-2023-6481 Référence CVE CVE-2024-1597 https://www.cve.org/CVERecord?id=CVE-2024-1597 Référence CVE CVE-2024-20918 https://www.cve.org/CVERecord?id=CVE-202

Official advisory ↗
CERT-FR · French · CERTFR-2024-AVI-0040Multiples vulnérabilités dans Atlassian Confluence et Jira

De multiples vulnérabilités ont été découvertes dans Atlassian Confluence et Jira. Certaines d'entre elles permettent à un attaquant de provoquer une exécution de code arbitraire à distance, un déni de service à distance et un contournement de la politique de sécurité.

Official advisory ↗
JVN iPedia · Japanese · JVNDB-2023-023191Square, Inc. の Okio における数値型間の変換の誤りに関する脆弱性

Square, Inc. の Okio には、数値型間の変換の誤りに関する脆弱性が存在します。

Official advisory ↗
JVN iPedia · Japanese · JVNDB-2026-010300Hitachi Ops Center Viewpointにおける複数の脆弱性

Hitachi Ops Center Viewpointに以下の脆弱性が存在します。 CVE-2014-3643, CVE-2023-3635, CVE-2023-6378, CVE-2023-6481, CVE-2023-35116, CVE-2024-12798, CVE-2024-12801, CVE-2024-47554

Official advisory ↗
NCSC-NL · Dutch · NCSC-2024-0414Kwetsbaarheden verholpen in Oracle Communications

Een kwaadwillende kan de kwetsbaarheden misbruiken om aanvallen uit te voeren die kunnen leiden tot de volgende categorieën schade: - Denial-of-Service (DoS) - Manipuleren van gegevens - Uitvoer van willekeurige code (Gebruikersrechten) - Uitvoer van willekeurige code (Administratorrechten) - Toegang tot gevoelige gegevens

Official advisory ↗
03

Patch and workaround

Operational remediation based on structured source evidence.

Status
?Patch availability is based on structured fixed-version fields and authoritative update references. If no fix is verified, check the vendor advisory before making a change.
Patch available
Affected
0.5.0 < 1.0.0, 1.0.0 < 1.17.6, 2.0.0 < 3.0.0, 3.0.0 < 3.4.0
Fixed
An authoritative update reference is available, but the fixed version is not recorded in the structured CVE fields. Check the linked vendor advisory for the applicable release.
Action
Review the linked authoritative reference and apply the recorded fixed release appropriate to the affected product branch.
Workaround
No verified workaround is recorded. If business-safe, reduce exposure to the affected interface and allow only trusted sources until authoritative guidance is available.
Official vendor articles1 stored document

Linked articles are downloaded and versioned as source evidence. A CVE mention or approved update relationship does not, by itself, verify a fix for every product branch.

04

Evidence and provenance

Published 12 Jul 2023 · Last source change 23 Oct 2024, 13:32 UTC · CWE-195 · Signed to Unsigned Conversion Error

CVE recordCVE.org · 5.1
CVSS sourceCNA
EPSS source
?The date BlackTree first stored a score for this CVE from the daily FIRST EPSS feed.
FIRST · tracked since 2026-08-14
European sourceENISA EUVD · EUVD-2023-2158
Product sourceUnavailable
Remediation sourceCVE/CNA references
CWE sourceCNA
NVD statusNVD modified after enrichment

Missing structured fields: affected product. Missing data is not evidence of low risk; review the primary advisory.

Material change intelligence

What changed after publication

View recent updates ↗

No material field changes have been recorded since change tracking began. Routine source refreshes and cosmetic edits are intentionally excluded.

Material fields only · duplicate refreshes suppressed · history retained for the configured operational retention period
CVE published
Fixed release or patch reference recorded
ENISA EUVD · EUVD-2023-2158↗Public exploit reference↗Patch or update reference↗Official CVE record (CNA and ADP data)↗NVD record↗
Technical terms and abbreviations used in this report
CVE
Common Vulnerabilities and Exposures: the public identifier for one disclosed vulnerability.
CVSS
Common Vulnerability Scoring System: a technical severity framework; it is not patching priority by itself.
EPSS
Exploit Prediction Scoring System: FIRST's estimate of the probability that exploitation activity will be observed in the next 30 days; it is a forecast, not confirmation.
CWE
Common Weakness Enumeration: the standard category describing the underlying software or hardware weakness.
CNA
CVE Numbering Authority: an organisation authorised to assign and publish CVE records.
CISA ADP
Cybersecurity and Infrastructure Security Agency Authorized Data Publisher: structured enrichment added to a CVE record.
NVD
National Vulnerability Database: NIST's enrichment service for CVE records.
CERT / CSIRT
A computer security incident response team that publishes warnings or coordinates incident response.
PoC
Proof of concept: public material that demonstrates or helps reproduce exploitation.
CSAF
Common Security Advisory Framework: a machine-readable format for security advisories.
LoTL
Living off the land: abuse of legitimate tools or system functions during an attack.
Free version - for non-commercial use only.CVE-2023-3635 · cve.blacktree.nl