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Full vulnerability report · 2025
CVE-2023-53159High confidence

The openssl crate before 0.10.55 for Rust allows an out-of-bounds read via an empty string to X509VerifyParamRef::set_host

sfackler · openssl

4.5MediumCVSS 3.1
Recommended action
Patch only the product branches with a verified fix

Medium technical severity with public exploit material referenced by a structured source; prioritise exposed affected systems while verifying vendor guidance. Verified remediation exists for at least one product or source, but 48 structured product or package states remain unresolved. Apply remediation only to the exact product branch confirmed by its source.

Fix availability varies by product
R
Operational reassessment

Published severity in operational context

Open reassessment dashboard →
Published severityMediumOperational priority:Medium, unchanged from published severity.unchanged

Evidence used

  • No CISA KEV confirmation is currently recorded.
  • A structured source references public exploit or proof-of-concept material.
  • EPSS is 0.20% for the current model date.

Compensating controls

  • Validate the affected product branch and deploy the verified fixed release.
  • Restrict local access and enforce least privilege on affected hosts.
  • Increase monitoring for the attack path and post-exploitation behaviour described in the report.

Verification

  1. Confirm that the asset runs sfackler openssl 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: As exposure requiresRemediation target: Within 365 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.

Cross-source reconciliation

Remediation availability differs by product scope

Verified remediation exists for at least one product or source, but 48 structured product or package states remain unresolved. Apply remediation only to the exact product branch confirmed by its source.

Distribution package intelligence

Release-specific package status

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

4 package states
Package result overrides the generic status

BlackTree has verified remediation for at least one product or source, but the relevant distribution still reports no fixed package for 1 affected package state shown here. Treat those rows as affected with no fix until that distribution publishes a fixed version.

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 · sourcerust-opensslVendor fix publishedDebian records a fixed source-package version for this release.0.10.57-1Debian Security Tracker ↗Source updated 5 Oct 2026
Debian bookwormbookworm · sourcerust-opensslAffected, no fix publishedDebian currently tracks this release as open.Not published in this feedDebian Security Tracker ↗Source updated 5 Oct 2026
Debian forkyforky · sourcerust-opensslVendor fix publishedDebian records a fixed source-package version for this release.0.10.57-1Debian Security Tracker ↗Source updated 5 Oct 2026
Debian sidsid · sourcerust-opensslVendor fix publishedDebian records a fixed source-package version for this release.0.10.57-1Debian Security Tracker ↗Source updated 5 Oct 2026
Open-source package ranges1 source-attributed range

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
rustopenssl>= 0.10.0, < 0.10.550.10.55GitHub advisory ↗github reviewed aggregator · 28 Jul 2025
Direct vendor intelligence

Authoritative vendor CSAF and VEX advisories

Structured product status and remediation from the issuing vendor. Product-state explanations are always visible; large lists can be searched or downloaded.

1 current
CVE-2023-53159 · CSAF 2.0 · revision 3 · finalRed Hat Product Securityopenssl: OpenSSL: Out-of-bounds Read Vulnerability
47 known affected

The vendor explicitly identifies these products as affected by this CVE.

  • openshift-logging/cluster-logging-operator-bundle as a component of Logging Subsystem for Red Hat OpenShift
  • openshift-logging/cluster-logging-rhel9-operator as a component of Logging Subsystem for Red Hat OpenShift
  • openshift-logging/eventrouter-rhel9 as a component of Logging Subsystem for Red Hat OpenShift
  • openshift-logging/log-file-metric-exporter-rhel9 as a component of Logging Subsystem for Red Hat OpenShift
  • openshift-logging/vector-rhel9 as a component of Logging Subsystem for Red Hat OpenShift
  • openshift-service-mesh-dev-preview-beta/istio-ztunnel-rhel9 as a component of OpenShift Service Mesh 3
  • openshift-service-mesh/istio-cni-rhel9 as a component of OpenShift Service Mesh 3
  • openshift-service-mesh/istio-must-gather-rhel9 as a component of OpenShift Service Mesh 3
  • openshift-service-mesh/istio-pilot-rhel9 as a component of OpenShift Service Mesh 3
  • openshift-service-mesh/istio-proxyv2-rhel9 as a component of OpenShift Service Mesh 3
  • openshift-service-mesh/istio-rhel9-operator as a component of OpenShift Service Mesh 3
  • openshift-service-mesh/istio-sail-operator-bundle as a component of OpenShift Service Mesh 3
Summary
A flaw was found in openssl. An out-of-bounds read can occur within the X509VerifyParamRef::set_host function when processing an empty string. A local attacker can trigger this condition by providing a specially crafted input, resulting in a potential information leak.
Remediation
Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.
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-2023-59771

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 actionPatch only the product branches with a verified fix

Medium technical severity with public exploit material referenced by a structured source; prioritise exposed affected systems while verifying vendor guidance. Verified remediation exists for at least one product or source, but 48 structured product or package states remain unresolved. Apply remediation only to the exact product branch confirmed by its source.

Fix availability varies by product
01

What, why and how

The openssl crate before 0.10.55 for Rust allows an out-of-bounds read via an empty string to X509VerifyParamRef::set_host.

What

The openssl crate before 0.10.55 for Rust allows an out-of-bounds read via an empty string to X509VerifyParamRef::set_host.

Why

The product reads from a buffer using buffer access mechanisms such as indexes or pointers that reference memory locations after the targeted buffer.

How

An attacker operating through local access may attempt exploitation without authentication or user interaction. If successful, the issue may cause the confidentiality, integrity or availability impact described by the vendor.

What

The openssl crate before 0.10.55 for Rust allows an out-of-bounds read via an empty string to X509VerifyParamRef::set_host.

Why

The product reads from a buffer using buffer access mechanisms such as indexes or pointers that reference memory locations after the targeted buffer.

How

An attacker operating through local access may attempt exploitation without authentication or user interaction. If successful, the issue may cause the confidentiality, integrity or availability impact described by the vendor.

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
local access → Buffer Over-read → cause the confidentiality, integrity or availability impact described by the vendor
Attack surface
Local
Privileges required
None: unauthenticated exploitation is possible
User interaction
None
Attack complexity
High: exploitation depends on specific conditions
Security boundary
Changed: exploitation can affect a different security authority
Weakness
?CWE means Common Weakness Enumeration: a standard category for the underlying weakness.
CWE-126 ↗

CWE-126: Buffer Over-read. The product reads from a buffer using buffer access mechanisms such as indexes or pointers that reference memory locations after the targeted buffer.

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

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

AVLocalAttack vector: The attacker needs local access to the vulnerable system.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.SChangedScope: The attack can affect a component governed by a different security authority.CLowConfidentiality impact: A successful attack can cause a limited loss.INoneIntegrity impact: No direct loss is represented by this metric.ALowAvailability impact: A successful attack can cause a limited loss.
Post-exploitation / living off the land
The issue can support a local privilege or sandbox boundary transition; normal system utilities may then be available in the gained context.
UnauthenticatedCWE-126Public exploit reference
A

Official authority intelligence

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

Cyber Security Agency of Singapore · English · CSA-SB-20250730Security Bulletin 30 Jul 2025 [827KB]

The Cyber Security Agency of Singapore included this CVE in its official Security Bulletin 30 Jul 2025 [827KB], published on 30 July 2025. Open the linked bulletin for the product, severity and reference information published in that issue.

Official advisory ↗
JVN iPedia · Japanese · JVNDB-2025-011366Steven Fackler の Rust 用 rust-openssl におけるバッファオーバーリードの脆弱性

Steven Fackler の Rust 用 rust-openssl には、バッファオーバーリードの脆弱性が存在します。

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.
Fix availability varies by product
Affected
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
Use the product-specific evidence above. Patch only products with a verified fixed release, and keep every affected or under-investigation state without a matching fix in the remediation queue.
Workaround
Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.
04

Evidence and provenance

Published 28 Jul 2025 · Last source change 28 Jul 2025, 13:54 UTC · CWE-126 · Buffer Over-read

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-2023-59771
Product sourceVendor CSAF · Red Hat Product Security
Remediation sourceVendor CSAF · Red Hat Product Security
CWE sourceCNA
NVD statusNVD enriched

Core structured fields are present and their contributing authorities are shown above.

Material change intelligence

What changed after publication

View recent updates ↗
  1. Affected versionsThe structured affected or fixed version information changed.
    Before
    openshift-logging/cluster-logging-operator-bundle as a component of Logging Subsystem for Red Hat OpenShift; openshift-logging/cluster-logging-rhel9-operator as a component of Logging Subsystem for Red Hat OpenShift; openshift-logging/eventrouter-rhel9 as a component of Logging Subsystem for Red Hat OpenShift; openshift-logging/log-file-metric-exporter-rhel9 as a component of Logging Subsystem for Red Hat OpenShift; openshift-logging/vector-rhel9 as a component of Logging Subsystem for Red Hat OpenShift; openshift-service-mesh-dev-preview-beta/istio-ztunnel-rhel9 as a component of OpenShift Service Mesh 3; openshift-service-mesh/istio-cni-rhel9 as a component of OpenShift Service Mesh 3; openshift-service-mesh/istio-must-gather-rhel9 as a component of OpenShift Service Mesh 3; openshift-service-mesh/istio-pilot-rhel9 as a component of OpenShift Service Mesh 3; openshift-service-mesh/istio-proxyv2-rhel9 as a component of OpenShift Service Mesh 3; openshift-service-mesh/istio-rhel9-operator as a component of OpenShift Service Mesh 3; openshift-service-mesh/istio-sail-operator-bundle as a component of OpenShift Service Mesh 3; firefox as a component of Red Hat Enterprise Linux 10; firefox.src as a component of Red Hat Enterprise Linux 10; gjs-devel as a component of Red Hat Enterprise Linux 10; gjs.src as a component of Red Hat Enterprise Linux 10; firefox as a component of Red Hat Enterprise Linux 7; firefox.src as a component of Red Hat Enterprise Linux 7; firefox as a component of Red Hat Enterprise Linux 8; firefox.src as a component of Red Hat Enterprise Linux 8; rpm-ostree-libs as a component of Red Hat Enterprise Linux 8; rpm-ostree.src as a component of Red Hat Enterprise Linux 8; 389-ds-base as a component of Red Hat Enterprise Linux 9; 389-ds-base-devel as a component of Red Hat Enterprise Linux 9; 389-ds-base-libs as a component of Red Hat Enterprise Linux 9; 389-ds-base-snmp as a component of Red Hat Enterprise Linux 9; 389-ds-base.src as a component of Red Hat Enterprise Linux 9; firefox as a component of Red Hat Enterprise Linux 9; firefox-x11 as a component of Red Hat Enterprise Linux 9; firefox.src as a component of Red Hat Enterprise Linux 9; and 21 more
    After
    openshift-logging/cluster-logging-operator-bundle as a component of Logging Subsystem for Red Hat OpenShift; openshift-logging/cluster-logging-rhel9-operator as a component of Logging Subsystem for Red Hat OpenShift; openshift-logging/eventrouter-rhel9 as a component of Logging Subsystem for Red Hat OpenShift; openshift-logging/log-file-metric-exporter-rhel9 as a component of Logging Subsystem for Red Hat OpenShift; openshift-logging/vector-rhel9 as a component of Logging Subsystem for Red Hat OpenShift; openshift-service-mesh-dev-preview-beta/istio-ztunnel-rhel9 as a component of OpenShift Service Mesh 3; openshift-service-mesh/istio-cni-rhel9 as a component of OpenShift Service Mesh 3; openshift-service-mesh/istio-must-gather-rhel9 as a component of OpenShift Service Mesh 3; openshift-service-mesh/istio-pilot-rhel9 as a component of OpenShift Service Mesh 3; openshift-service-mesh/istio-proxyv2-rhel9 as a component of OpenShift Service Mesh 3; openshift-service-mesh/istio-rhel9-operator as a component of OpenShift Service Mesh 3; openshift-service-mesh/istio-sail-operator-bundle as a component of OpenShift Service Mesh 3; firefox as a component of Red Hat Enterprise Linux 10; firefox.src as a component of Red Hat Enterprise Linux 10; gjs-devel as a component of Red Hat Enterprise Linux 10; gjs.src as a component of Red Hat Enterprise Linux 10; firefox as a component of Red Hat Enterprise Linux 7; firefox.src as a component of Red Hat Enterprise Linux 7; firefox as a component of Red Hat Enterprise Linux 8; firefox.src as a component of Red Hat Enterprise Linux 8; rpm-ostree-libs as a component of Red Hat Enterprise Linux 8; rpm-ostree.src as a component of Red Hat Enterprise Linux 8; 389-ds-base as a component of Red Hat Enterprise Linux 9; 389-ds-base-devel as a component of Red Hat Enterprise Linux 9; 389-ds-base-libs as a component of Red Hat Enterprise Linux 9; 389-ds-base-snmp as a component of Red Hat Enterprise Linux 9; 389-ds-base.src as a component of Red Hat Enterprise Linux 9; firefox as a component of Red Hat Enterprise Linux 9; firefox-x11 as a component of Red Hat Enterprise Linux 9; firefox.src as a component of Red Hat Enterprise Linux 9; and 17 more
    Red Hat Product Security ↗
  2. Affected versionsThe structured affected or fixed version information changed.
    Before
    < 0.10.55 · 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.
    After
    openssl: < 0.10.55 · 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.
    CNA ↗
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-2023-59771↗Vendor CSAF · Red Hat Product Security↗Public exploit reference↗CVE authority or vendor 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-2023-53159 · cve.blacktree.nl