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Full vulnerability report · 2020
CVE-2020-6829High confidence

Given an electro-magnetic trace of a few signature generations, the private key could have been computed

Mozilla · Firefox

5.3MediumCVSS 3.1
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
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-2020-6829 · CSAF 2.0 · revision 3 · finalRed Hat Product Securitynss: Side channel attack on ECDSA signature generation
7 known affected

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

  • nss.src as a component of Red Hat Enterprise Linux 5
  • nss as a component of Red Hat Enterprise Linux 6
  • nss-devel as a component of Red Hat Enterprise Linux 6
  • nss-pkcs11-devel as a component of Red Hat Enterprise Linux 6
  • nss-sysinit as a component of Red Hat Enterprise Linux 6
  • nss-tools as a component of Red Hat Enterprise Linux 6
  • nss.src as a component of Red Hat Enterprise Linux 6
Summary
A flaw was found in nss. Using the EM side-channel, it is possible to extract the position of zero and non-zero wNAF digits while nss-certutil tool performs scalar multiplication during the ECDSA signature generation, leaking partial information about the ECDSA nonce. Given a small number of ECDSA signatures, this information can be used to steal the private key. The highest threat from this vulnerability is to data confidentiality.
Remediation
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 After installing this update, applications using NSS or NSPR (for example, Firefox) must be restarted for this update to take effect.
Optional official sources

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

Select the national-authority views to include. The exact source language is shown on each matched advisory. Your choice is remembered on this device and encoded in the shareable URL.

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-2020-27973

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

When performing EC scalar point multiplication, the wNAF point multiplication algorithm was used; which leaked partial information about the nonce used during signature generation. Given an electro-magnetic trace of a few signature generations, the private key could have been computed. This vulnerability affects Firefox < 80 and Firefox for Android < 80.

What

When performing EC scalar point multiplication, the wNAF point multiplication algorithm was used; which leaked partial information about the nonce used during signature generation. Given an electro-magnetic trace of a few signature generations, the private key could have been computed. This vulnerability affects Firefox < 80 and Firefox for Android < 80.

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

When performing EC scalar point multiplication, the wNAF point multiplication algorithm was used; which leaked partial information about the nonce used during signature generation. Given an electro-magnetic trace of a few signature generations, the private key could have been computed. This vulnerability affects Firefox < 80 and Firefox for Android < 80.

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
Low: no specialised conditions are recorded
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:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

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.ACLowAttack complexity: No specialised conditions are required beyond attacker-controlled input.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.CLowConfidentiality impact: A successful attack can cause a limited 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-W-2024-1591Juniper JUNOS: Mehrere Schwachstellen

Ein Angreifer kann mehrere Schwachstellen in Juniper JUNOS ausnutzen, um einen Denial of Service zu verursachen, Informationen offenzulegen, Privilegien zu erweitern und Sicherheitsmechanismen inklusive zu umgehen.

Official advisory
BSI · German · WID-SEC-W-2022-1831Mozilla NSS: Schwachstelle ermöglicht nicht spezifizierten Angriff

Ein Angreifer kann eine Schwachstelle in Mozilla NSS ausnutzen, um einen nicht näher spezifizierten Angriff durchzuführen.

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

d?id=CVE-2020-19189 Référence CVE CVE-2020-23064 https://www.cve.org/CVERecord?id=CVE-2020-23064 Référence CVE CVE-2020-25648 https://www.cve.org/CVERecord?id=CVE-2020-25648 Référence CVE CVE-2020-26261 https://www.cve.org/CVERecord?id=CVE-2020-26261 Référence CVE CVE-2020-35521 https://www.cve.org/CVERecord?id=CVE-2020-35521 Référence CVE CVE-2020-35522 https://www.cve.org/CVERecord?id=CVE-2020-35522 Référence CVE CVE-2020-35523 https://www.cve.org/CVERecord?id=CVE-2020-35523 Référence CVE CVE-2020-35524 https://www.cve.org/CVERecord?id=CVE-2020-35524 Référence CVE CVE-2020-36191 https://www.cve.org/CVERecord?id=CVE-2020-36191 Référence CVE CVE-2020-6829 https://www.cve.org/CVERecord?id=CVE-2020-6829 Référence CVE CVE-2021-32862 https://www.cve.org/CVERecord?id=CVE-2021-32862 Référence CVE CVE-2021-36770 https://www.cve.org/CVERecord?id=CVE-2021-36770 Référence CVE CVE-2021-38153 https://www.cve.org/CVERecord?id=CVE-2021-38153 Référence CVE CVE-2021-43138 https://www.cve.org/CVERecord?id=CVE-2021-43138 Référence CVE CVE-2021-45960 https://www.cve.org/CVERecord?id=CVE-2021-45960 Référence CVE CVE-2021-46848 https://www.cve.org/CVERecord?id=CVE-2021-46848 Référence CVE CVE-2022-0561 https://www.cve.org/CVERecord?id=CVE-2022-0561 Référence CVE CVE-2022-0562 https://www.cve.org/CVERecord?id=CVE-

Official advisory
CERT-FR · French · CERTFR-2024-AVI-0575Multiples vulnérabilités dans les produits Juniper Networks

ecord?id=CVE-2020-13938 Référence CVE CVE-2020-13950 https://www.cve.org/CVERecord?id=CVE-2020-13950 Référence CVE CVE-2020-14145 https://www.cve.org/CVERecord?id=CVE-2020-14145 Référence CVE CVE-2020-1927 https://www.cve.org/CVERecord?id=CVE-2020-1927 Référence CVE CVE-2020-1934 https://www.cve.org/CVERecord?id=CVE-2020-1934 Référence CVE CVE-2020-28469 https://www.cve.org/CVERecord?id=CVE-2020-28469 Référence CVE CVE-2020-28502 https://www.cve.org/CVERecord?id=CVE-2020-28502 Référence CVE CVE-2020-35452 https://www.cve.org/CVERecord?id=CVE-2020-35452 Référence CVE CVE-2020-36049 https://www.cve.org/CVERecord?id=CVE-2020-36049 Référence CVE CVE-2020-6829 https://www.cve.org/CVERecord?id=CVE-2020-6829 Référence CVE CVE-2020-7660 https://www.cve.org/CVERecord?id=CVE-2020-7660 Référence CVE CVE-2020-7754 https://www.cve.org/CVERecord?id=CVE-2020-7754 Référence CVE CVE-2020-7774 https://www.cve.org/CVERecord?id=CVE-2020-7774 Référence CVE CVE-2020-8648 https://www.cve.org/CVERecord?id=CVE-2020-8648 Référence CVE CVE-2020-9490 https://www.cve.org/CVERecord?id=CVE-2020-9490 Référence CVE CVE-2021-22543 https://www.cve.org/CVERecord?id=CVE-2021-22543 Référence CVE CVE-2021-2342 https://www.cve.org/CVERecord?id=CVE-2021-2342 Référence CVE CVE-2021-23440 https://www.cve.org/CVERecord?id=CVE-2021-2344

Official advisory
CERT-FR · French · CERTFR-2022-AVI-267Multiples vulnérabilités dans Juniper Networks Junos Space

CVERecord?id=CVE-2020-15999 Référence CVE CVE-2020-1749 https://www.cve.org/CVERecord?id=CVE-2020-1749 Référence CVE CVE-2020-1983 https://www.cve.org/CVERecord?id=CVE-2020-1983 Référence CVE CVE-2020-24394 https://www.cve.org/CVERecord?id=CVE-2020-24394 Référence CVE CVE-2020-25212 https://www.cve.org/CVERecord?id=CVE-2020-25212 Référence CVE CVE-2020-25637 https://www.cve.org/CVERecord?id=CVE-2020-25637 Référence CVE CVE-2020-25643 https://www.cve.org/CVERecord?id=CVE-2020-25643 Référence CVE CVE-2020-2732 https://www.cve.org/CVERecord?id=CVE-2020-2732 Référence CVE CVE-2020-5208 https://www.cve.org/CVERecord?id=CVE-2020-5208 Référence CVE CVE-2020-6829 https://www.cve.org/CVERecord?id=CVE-2020-6829 Référence CVE CVE-2020-7039 https://www.cve.org/CVERecord?id=CVE-2020-7039 Référence CVE CVE-2020-8647 https://www.cve.org/CVERecord?id=CVE-2020-8647 Référence CVE CVE-2020-8649 https://www.cve.org/CVERecord?id=CVE-2020-8649 Référence CVE CVE-2020-9383 https://www.cve.org/CVERecord?id=CVE-2020-9383 Référence CVE CVE-2021-3156 https://www.cve.org/CVERecord?id=CVE-2021-3156 Référence CVE CVE-2021-3396 https://www.cve.org/CVERecord?id=CVE-2021-3396 Gestion détaillée du document le 23 mars 2022 Version initiale Alertes Avis Bulletins d’actualités Mentions légales Conditions générales À propos Contac

Official advisory
CERT-FR · French · CERTFR-2020-AVI-543Multiples vulnérabilités dans Mozilla Firefox

De multiples vulnérabilités ont été découvertes dans Mozilla Firefox. Elles permettent à un attaquant de provoquer une exécution de code arbitraire à distance, un contournement de la politique de sécurité et une atteinte à la confidentialité des données.

Official advisory
CERT-FR · French · CERTFR-2020-AVI-532Multiples vulnérabilités dans Mozilla Firefox

De multiples vulnérabilités ont été découvertes dans Mozilla Firefox. Certaines d'entre elles permettent à un attaquant de provoquer une exécution de code arbitraire à distance, un contournement de la politique de sécurité et une atteinte à l'intégrité des données.

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
nss.src as a component of Red Hat Enterprise Linux 5; nss as a component of Red Hat Enterprise Linux 6; nss-devel as a component of Red Hat Enterprise Linux 6; nss-pkcs11-devel as a component of Red Hat Enterprise Linux 6; nss-sysinit as a component of Red Hat Enterprise Linux 6; nss-tools as a component of Red Hat Enterprise Linux 6; nss.src as a component of Red Hat Enterprise Linux 6
Fixed
nspr-0:4.25.0-2.el7_9.i686 as a component of Red Hat Enterprise Linux Client (v. 7); nspr-0:4.25.0-2.el7_9.src as a component of Red Hat Enterprise Linux Client (v. 7); nspr-0:4.25.0-2.el7_9.x86_64 as a component of Red Hat Enterprise Linux Client (v. 7); nspr-debuginfo-0:4.25.0-2.el7_9.i686 as a component of Red Hat Enterprise Linux Client (v. 7); nspr-debuginfo-0:4.25.0-2.el7_9.x86_64 as a component of Red Hat Enterprise Linux Client (v. 7); nss-0:3.53.1-3.el7_9.i686 as a component of Red Hat Enterprise Linux Client (v. 7); nss-0:3.53.1-3.el7_9.src as a component of Red Hat Enterprise Linux Client (v. 7); nss-0:3.53.1-3.el7_9.x86_64 as a component of Red Hat Enterprise Linux Client (v. 7); nss-debuginfo-0:3.53.1-3.el7_9.i686 as a component of Red Hat Enterprise Linux Client (v. 7); nss-debuginfo-0:3.53.1-3.el7_9.x86_64 as a component of Red Hat Enterprise Linux Client (v. 7); nss-softokn-0:3.53.1-6.el7_9.i686 as a component of Red Hat Enterprise Linux Client (v. 7); nss-softokn-0:3.53.1-6.el7_9.src as a component of Red Hat Enterprise Linux Client (v. 7); nss-softokn-0:3.53.1-6.el7_9.x86_64 as a component of Red Hat Enterprise Linux Client (v. 7); nss-softokn-debuginfo-0:3.53.1-6.el7_9.i686 as a component of Red Hat Enterprise Linux Client (v. 7); nss-softokn-debuginfo-0:3.53.1-6.el7_9.x86_64 as a component of Red Hat Enterprise Linux Client (v. 7); nss-softokn-freebl-0:3.53.1-6.el7_9.i686 as a component of Red Hat Enterprise Linux Client (v. 7); nss-softokn-freebl-0:3.53.1-6.el7_9.x86_64 as a component of Red Hat Enterprise Linux Client (v. 7); nss-sysinit-0:3.53.1-3.el7_9.x86_64 as a component of Red Hat Enterprise Linux Client (v. 7); nss-tools-0:3.53.1-3.el7_9.x86_64 as a component of Red Hat Enterprise Linux Client (v. 7); nss-util-0:3.53.1-1.el7_9.i686 as a component of Red Hat Enterprise Linux Client (v. 7); nss-util-0:3.53.1-1.el7_9.src as a component of Red Hat Enterprise Linux Client (v. 7); nss-util-0:3.53.1-1.el7_9.x86_64 as a component of Red Hat Enterprise Linux Client (v. 7); nss-util-debuginfo-0:3.53.1-1.el7_9.i686 as a component of Red Hat Enterprise Linux Client (v. 7); nss-util-debuginfo-0:3.53.1-1.el7_9.x86_64 as a component of Red Hat Enterprise Linux Client (v. 7); nspr-debuginfo-0:4.25.0-2.el7_9.i686 as a component of Red Hat Enterprise Linux Client Optional (v. 7); nspr-debuginfo-0:4.25.0-2.el7_9.x86_64 as a component of Red Hat Enterprise Linux Client Optional (v. 7); nspr-devel-0:4.25.0-2.el7_9.i686 as a component of Red Hat Enterprise Linux Client Optional (v. 7); nspr-devel-0:4.25.0-2.el7_9.x86_64 as a component of Red Hat Enterprise Linux Client Optional (v. 7); nss-debuginfo-0:3.53.1-3.el7_9.i686 as a component of Red Hat Enterprise Linux Client Optional (v. 7); nss-debuginfo-0:3.53.1-3.el7_9.x86_64 as a component of Red Hat Enterprise Linux Client Optional (v. 7); and 281 more
Action
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 After installing this update, applications using NSS or NSPR (for example, Firefox) must be restarted for this update to take effect.
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 28 Oct 2020 · Last source change 4 Aug 2024, 09:11 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 2026-08-14
European sourceENISA EUVD · EUVD-2020-27973
Product sourceVendor CSAF · Red Hat Product Security
Remediation sourceVendor CSAF · Red Hat Product Security
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 →

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
ENISA EUVD · EUVD-2020-27973↗Vendor CSAF · Red Hat Product Security↗CVE authority or vendor reference↗Vendor advisory↗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-2020-6829 · cve.blacktree.nl