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Full vulnerability report · 2019
CVE-2018-12404High confidence

A cached side channel attack during handshakes using RSA encryption could allow for the decryption of encrypted content

Mozilla · Network Security Services (NSS)

5.9MediumCVSS 3.0
Recommended action
Scheduled

Medium technical severity with no CISA KEV confirmation; remediate through the normal risk-based patch cycle unless local exposure raises the priority.

Patch available
R
Operational reassessment

Published severity in operational context

Open reassessment dashboard →
Published severityMediumOperational priority:High, raised one band.upgradedsince 23 Oct 2026

Evidence used

  • No CISA KEV confirmation is currently recorded.
  • The selected CVSS metric records a network-reachable, unauthenticated path with no user interaction.
  • EPSS is 44.25% 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.
  • Monitor vendor guidance and exploitation sources for a material change.

Verification

  1. Confirm that the asset runs Mozilla Network Security Services (NSS) 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

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

7 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
Alpine v3.23v3.23 · mainnssVendor fix publishedAlpine records a security fix at this version. An absent entry does not mean the package is unaffected.3.41-r0Alpine Security Database ↗Source updated 23 Oct 2026
Alpine v3.22v3.22 · mainnssVendor fix publishedAlpine records a security fix at this version. An absent entry does not mean the package is unaffected.3.41-r0Alpine Security Database ↗Source updated 23 Oct 2026
Alpine v3.21v3.21 · mainnssVendor fix publishedAlpine records a security fix at this version. An absent entry does not mean the package is unaffected.3.41-r0Alpine Security Database ↗Source updated 23 Oct 2026
Debian trixietrixie · sourcenssVendor fix publishedDebian records a fixed source-package version for this release.2:3.41-1Debian Security Tracker ↗Source updated 23 Oct 2026
Debian bookwormbookworm · sourcenssVendor fix publishedDebian records a fixed source-package version for this release.2:3.41-1Debian Security Tracker ↗Source updated 23 Oct 2026
Debian forkyforky · sourcenssVendor fix publishedDebian records a fixed source-package version for this release.2:3.41-1Debian Security Tracker ↗Source updated 23 Oct 2026
Debian sidsid · sourcenssVendor fix publishedDebian records a fixed source-package version for this release.2:3.41-1Debian Security Tracker ↗Source updated 23 Oct 2026
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-2018-12404 · CSAF 2.0 · revision 54 · interimSUSE Product Security TeamCVE-2018-12404
13 known affected

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

  • mozilla-nss as component of SUSE Linux Enterprise Server 11 SP1 for Teradata
  • SLES 15 SP1 CHOST Images for Amazon EC2
  • SLES 15 SP2 CHOST Images for Amazon EC2
  • SLES 15 SP4 CHOST Images for Amazon EC2
  • SLES 15 SP5 CHOST Images for Amazon EC2
  • SLES 15 SP1 CHOST Images for Google
  • SLES 15 SP2 CHOST Images for Google
  • SLES 15 SP4 CHOST Images for Google
  • SLES 15 SP5 CHOST Images for Google
  • SLES 15 SP1 CHOST Images for Microsoft Azure
  • SLES 15 SP2 CHOST Images for Microsoft Azure
  • SLES 15 SP4 CHOST Images for Microsoft Azure
Summary
A cached side channel attack during handshakes using RSA encryption could allow for the decryption of encrypted content. This is a variant of the Adaptive Chosen Ciphertext attack (AKA Bleichenbacher attack) and affects all NSS versions prior to NSS 3.41.
Remediation
To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".
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-2018-4378

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 actionScheduled

Medium technical severity with no CISA KEV confirmation; remediate through the normal risk-based patch cycle unless local exposure raises the priority.

Patch available
01

What, why and how

A cached side channel attack during handshakes using RSA encryption could allow for the decryption of encrypted content. This is a variant of the Adaptive Chosen Ciphertext attack (AKA Bleichenbacher attack) and affects all NSS versions prior to NSS 3.41.

What

A cached side channel attack during handshakes using RSA encryption could allow for the decryption of encrypted content. This is a variant of the Adaptive Chosen Ciphertext attack (AKA Bleichenbacher attack) and affects all NSS versions prior to NSS 3.41.

Why

The current structured CVE record identifies a security weakness, but the root cause requires confirmation in the linked vendor material.

How

An attacker operating through a network path 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

A cached side channel attack during handshakes using RSA encryption could allow for the decryption of encrypted content. This is a variant of the Adaptive Chosen Ciphertext attack (AKA Bleichenbacher attack) and affects all NSS versions prior to NSS 3.41.

Why

The current structured CVE record identifies a security weakness, but the root cause requires confirmation in the linked vendor material.

How

An attacker operating through a network path 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.
None recorded

No exploit-tagged reference or CISA SSVC proof-of-concept state is currently recorded. Research may still exist outside the structured feeds.

Likely attack path
a network path → vulnerable operation → cause the confidentiality, integrity or availability impact described by the vendor
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.
CWE not yet assigned
CVSS vector
?CVSS means Common Vulnerability Scoring System. The vector records the metric values used to calculate technical severity.
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

Common Vulnerability Scoring System 3.0: 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.CHighConfidentiality impact: A successful attack can cause a major loss.INoneIntegrity impact: No direct loss is represented by this metric.ANoneAvailability impact: No direct loss is represented by this metric.
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.
NetworkUnauthenticated
A

Official authority intelligence

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

BSI · German · WID-SEC-2022-0517Red Hat Enterprise Linux: Mehrere Schwachstellen

Ein entfernter, anonymer oder authentisierter Angreifer kann mehrere Schwachstellen in Red Hat Enterprise Linux ausnutzen, um dadurch die Integrität, Vertraulichkeit und Verfügbarkeit zu gefährden.

Official advisory ↗
BSI · German · WID-SEC-2025-1212Oracle Communications Applications: Mehrere Schwachstellen

Ein Angreifer kann mehrere Schwachstellen in Oracle Communications Applications ausnutzen, um dadurch die Integrität, Vertraulichkeit und Verfügbarkeit zu gefährden.

Official advisory ↗
CERT-FR · French · CERTFR-2024-AVI-1103Multiples vulnérabilités dans les produits IBM

ecord?id=CVE-2017-11697 Référence CVE CVE-2017-11698 https://www.cve.org/CVERecord?id=CVE-2017-11698 Référence CVE CVE-2017-12627 https://www.cve.org/CVERecord?id=CVE-2017-12627 Référence CVE CVE-2017-12652 https://www.cve.org/CVERecord?id=CVE-2017-12652 Référence CVE CVE-2017-18013 https://www.cve.org/CVERecord?id=CVE-2017-18013 Référence CVE CVE-2017-18869 https://www.cve.org/CVERecord?id=CVE-2017-18869 Référence CVE CVE-2017-5461 https://www.cve.org/CVERecord?id=CVE-2017-5461 Référence CVE CVE-2017-9937 https://www.cve.org/CVERecord?id=CVE-2017-9937 Référence CVE CVE-2018-12384 https://www.cve.org/CVERecord?id=CVE-2018-12384 Référence CVE CVE-2018-12404 https://www.cve.org/CVERecord?id=CVE-2018-12404 Référence CVE CVE-2018-14040 https://www.cve.org/CVERecord?id=CVE-2018-14040 Référence CVE CVE-2018-14041 https://www.cve.org/CVERecord?id=CVE-2018-14041 Référence CVE CVE-2018-14042 https://www.cve.org/CVERecord?id=CVE-2018-14042 Référence CVE CVE-2018-15209 https://www.cve.org/CVERecord?id=CVE-2018-15209 Référence CVE CVE-2018-16335 https://www.cve.org/CVERecord?id=CVE-2018-16335 Référence CVE CVE-2018-17000 https://www.cve.org/CVERecord?id=CVE-2018-17000 Référence CVE CVE-2018-17100 https://www.cve.org/CVERecord?id=CVE-2018-17100 Référence CVE CVE-2018-17101 https://www.cve.org/CVERecord?id=

Official advisory ↗
CERT-FR · French · CERTFR-2021-AVI-094Multiples vulnérabilités dans les produits Siemens

productcert/pdf/ssa-536315.pdf Bulletin de sécurité Siemens SSA-541017 du 9 février 2021 https://cert-portal.siemens.com/productcert/pdf/ssa-541017.pdf Bulletin de sécurité Siemens SSA-663999 du 9 février 2021 https://cert-portal.siemens.com/productcert/pdf/ssa-663999.pdf Bulletin de sécurité Siemens SSA-686152 du 9 février 2021 https://cert-portal.siemens.com/productcert/pdf/ssa-686152.pdf Bulletin de sécurité Siemens SSA-794542 du 9 février 2021 https://cert-portal.siemens.com/productcert/pdf/ssa-794542.pdf Bulletin de sécurité Siemens SSA-944678 du 9 février 2021 https://cert-portal.siemens.com/productcert/pdf/ssa-944678.pdf Référence CVE CVE-2018-12404 https://www.cve.org/CVERecord?id=CVE-2018-12404 Référence CVE CVE-2018-18508 https://www.cve.org/CVERecord?id=CVE-2018-18508 Référence CVE CVE-2019-11745 https://www.cve.org/CVERecord?id=CVE-2019-11745 Référence CVE CVE-2019-17006 https://www.cve.org/CVERecord?id=CVE-2019-17006 Référence CVE CVE-2019-17007 https://www.cve.org/CVERecord?id=CVE-2019-17007 Référence CVE CVE-2020-10048 https://www.cve.org/CVERecord?id=CVE-2020-10048 Référence CVE CVE-2020-13988 https://www.cve.org/CVERecord?id=CVE-2020-13988 Référence CVE CVE-2020-1763 https://www.cve.org/CVERecord?id=CVE-2020-1763 Référence CVE CVE-2020-25237 https://www.cve.org/CVERecord?id=CV

Official advisory ↗
CERT-FR · French · CERTFR-2019-AVI-510Multiples vulnérabilités dans Oracle Systems

De multiples vulnérabilités ont été découvertes dans Oracle Systems. Certaines d'entre elles permettent à un attaquant de provoquer une exécution de code arbitraire à distance, un déni de service à distance et une atteinte à l'intégrité des données.

Official advisory ↗
JVN iPedia · Japanese · JVNDB-2018-015300NSS における暗号に関する脆弱性

NSS には、暗号に関する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.
Patch available
Affected
Fixed
No fixed version is explicitly recorded in the structured CVE data.
Action
To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".
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.
04

Evidence and provenance

Published 2 May 2019 · Last source change 5 Aug 2024, 08:38 UTC · CWE not yet assigned

CVE recordCVE.org · 5.1
CVSS sourceNIST NVD
EPSS source
?The date BlackTree first stored a score for this CVE from the daily FIRST EPSS feed.
FIRST · tracked since 2026-09-01
European sourceENISA EUVD · EUVD-2018-4378
Product sourceVendor CSAF · SUSE Product Security Team
Remediation sourceVendor CSAF · SUSE Product Security Team
CWE sourceUnavailable
NVD statusNVD modified after enrichment

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

Material change intelligence

What changed after publication

View recent updates ↗
  1. Remediation statusRemediation status changed from Awaiting fix to Mitigation available.
    Before
    Awaiting fix
    After
    Mitigation available
    SUSE Product Security Team ↗
  2. ENISA EUVD mappingEUVD-2018-4378 was added to the official ENISA EUVD mapping for this CVE.
    Before
    not recorded
    After
    {"euvdId":"EUVD-2018-4378"}
    ENISA EUVD ↗
  3. Vendor guidanceAuthoritative vendor guidance changed: added vendor advisory: bugzilla.mozilla.org/show_bug.cgi?id=CVE-2018-12404; removed vendor advisory: access.redhat.com/RHSA-2019:2237; removed vendor advisory: lists.opensuse.org/msg00021.html.
    Before
    vendor advisory: access.redhat.com/RHSA-2019:2237 · vendor advisory: lists.opensuse.org/msg00021.html
    After
    vendor advisory: bugzilla.mozilla.org/show_bug.cgi?id=CVE-2018-12404
    bugzilla.mozilla.org ↗
  4. SeveritySeverity changed from Unknown to Medium.
    Before
    Unknown
    After
    Medium
    NIST NVD ↗
  5. CVSS scoreCVSS score changed from not recorded to 5.9 (CVSS 3.0 · NIST NVD · CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N).
    Before
    not recorded
    After
    5.9 (CVSS 3.0 · NIST NVD · CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N)
    NIST NVD ↗
  6. Catalogue recordCVE added to the BlackTree catalogue.
    CNA ↗
Material fields only · duplicate refreshes suppressed · history retained for the configured operational retention period
CVE published
Remediation guidance recorded
Remediation guidance recorded
ENISA EUVD · EUVD-2018-4378↗SUSE Product Security Team security advisory↗Vendor advisory↗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-2018-12404 · cve.blacktree.nl