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Full vulnerability report · 2018
CVE-2017-5460High confidence

A use-after-free vulnerability in frame selection triggered by a combination of malicious script content and key presses by a user

Mozilla · Thunderbird

Official source article: Red Hat RHSA-2017:1106 ↗. Check the applicable product and release in the original source.

9.8CriticalCVSS 3.0
Recommended action
Within 72 hours

Critical technical impact with a remotely reachable, unauthenticated path and a public exploit reference; no CISA KEV confirmation is currently recorded.

Patch available
R
Operational reassessment

Published severity in operational context

Open reassessment dashboard →
Published severityCriticalOperational priority:Critical, 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.
  • The selected CVSS metric records a network-reachable, unauthenticated path with no user interaction.
  • EPSS is 3.00% 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 Mozilla Thunderbird 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 3 daysRemediation target: Within 90 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 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 · sourcefirefox-esrVendor fix publishedDebian records a fixed source-package version for this release.45.9.0esr-1Debian Security Tracker ↗Source updated 5 Oct 2026
Debian bookwormbookworm · sourcefirefox-esrVendor fix publishedDebian records a fixed source-package version for this release.45.9.0esr-1Debian Security Tracker ↗Source updated 5 Oct 2026
Debian forkyforky · sourcefirefox-esrVendor fix publishedDebian records a fixed source-package version for this release.45.9.0esr-1Debian Security Tracker ↗Source updated 5 Oct 2026
Debian sidsid · sourcefirefoxVendor fix publishedDebian records a fixed source-package version for this release.52.0.1-1Debian Security Tracker ↗Source updated 5 Oct 2026
Debian sidsid · sourcefirefox-esrVendor fix publishedDebian records a fixed source-package version for this release.45.9.0esr-1Debian Security Tracker ↗Source updated 5 Oct 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-2017-14564

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 72 hours

Critical technical impact with a remotely reachable, unauthenticated path and a public exploit reference; no CISA KEV confirmation is currently recorded.

Patch available
01

What, why and how

A use-after-free vulnerability in frame selection triggered by a combination of malicious script content and key presses by a user. This results in a potentially exploitable crash. This vulnerability affects Thunderbird < 52.1, Firefox ESR < 45.9, Firefox ESR < 52.1, and Firefox < 53.

What

A use-after-free vulnerability in frame selection triggered by a combination of malicious script content and key presses by a user. This results in a potentially exploitable crash. This vulnerability affects Thunderbird < 52.1, Firefox ESR < 45.9, Firefox ESR < 52.1, and Firefox < 53.

Why

The program can continue using memory after it has been released, producing unsafe and attacker-influenceable behaviour.

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

A use-after-free vulnerability in frame selection triggered by a combination of malicious script content and key presses by a user. This results in a potentially exploitable crash. This vulnerability affects Thunderbird < 52.1, Firefox ESR < 45.9, Firefox ESR < 52.1, and Firefox < 53.

Why

The program can continue using memory after it has been released, producing unsafe and attacker-influenceable behaviour.

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 → Use After Free → disrupt the affected service
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: a standard category for the underlying weakness.
CWE-416 ↗

CWE-416: Use After Free. The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory belongs to the code that operates on the new pointer.

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:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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.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.CHighConfidentiality impact: A successful attack can cause a major loss.IHighIntegrity impact: A successful attack can cause a major loss.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-416Public exploit reference
A

Official authority intelligence

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

Canadian Centre for Cyber Security · English · AV17-052Mozilla Releases security updates

in Firefox and Firefox ESR. The severity of these issues ranges from low to critical. Versions affected: Firefox versions prior to 53 ESR versions 45.x prior to 45.9 ESR versions 52.x prior to 52.1 CVE References:  CVE-2017-5429, CVE-2017-5430, CVE-2017-5432, CVE-2017-5433, CVE-2017-5434, CVE-2017-5435, CVE-2017-5436, CVE-2017-5437, CVE-2017-5438, CVE-2017-5439, CVE-2017-5440, CVE-2017-5441, CVE-2017-5442, CVE-2017-5443, CVE-2017-5444, CVE-2017-5445, CVE-2017-5446, CVE-2017-5447, CVE-2017-5448, CVE-2017-5449, CVE-2017-5450, CVE-2017-5451, CVE-2017-5452, CVE-2017-5453, CVE-2017-5454, CVE-2017-5455, CVE-2017-5456, CVE-2017-5458, CVE-2017-5459, CVE-2017-5460, CVE-2017-5461, CVE-2017-5462, CVE-2017-5463, CVE-2017-5464, CVE-2017-5465, CVE-2017-5466, CVE-2017-5467, CVE-2017-5468, CVE-2017-5469 Suggested Action CCIRC recommends that system administrators test and deploy the vendor-released updates to affected applications accordingly. References: https://www.mozilla.org/en-US/security/advisories/mfsa2017-10/ https://www.mozilla.org/en-US/security/advisories/mfsa2017-11/ https://www.mozilla.org/en-US/security/advisories/mfsa2017-12/

Official advisory ↗
CERT-FR · French · CERTFR-2017-AVI-134Multiples vulnérabilités dans Mozilla Thunderbird

.cve.org/CVERecord?id=CVE-2017-5443 Référence CVE CVE-2017-5444 https://www.cve.org/CVERecord?id=CVE-2017-5444 Référence CVE CVE-2017-5445 https://www.cve.org/CVERecord?id=CVE-2017-5445 Référence CVE CVE-2017-5446 https://www.cve.org/CVERecord?id=CVE-2017-5446 Référence CVE CVE-2017-5447 https://www.cve.org/CVERecord?id=CVE-2017-5447 Référence CVE CVE-2017-5449 https://www.cve.org/CVERecord?id=CVE-2017-5449 Référence CVE CVE-2017-5451 https://www.cve.org/CVERecord?id=CVE-2017-5451 Référence CVE CVE-2017-5454 https://www.cve.org/CVERecord?id=CVE-2017-5454 Référence CVE CVE-2017-5459 https://www.cve.org/CVERecord?id=CVE-2017-5459 Référence CVE CVE-2017-5460 https://www.cve.org/CVERecord?id=CVE-2017-5460 Référence CVE CVE-2017-5461 https://www.cve.org/CVERecord?id=CVE-2017-5461 Référence CVE CVE-2017-5462 https://www.cve.org/CVERecord?id=CVE-2017-5462 Référence CVE CVE-2017-5464 https://www.cve.org/CVERecord?id=CVE-2017-5464 Référence CVE CVE-2017-5465 https://www.cve.org/CVERecord?id=CVE-2017-5465 Référence CVE CVE-2017-5466 https://www.cve.org/CVERecord?id=CVE-2017-5466 Référence CVE CVE-2017-5467 https://www.cve.org/CVERecord?id=CVE-2017-5467 Référence CVE CVE-2017-5469 https://www.cve.org/CVERecord?id=CVE-2017-5469 Gestion détaillée du document le 02 mai 2017 version initiale. Alertes Avis B

Official advisory ↗
CERT-FR · French · CERTFR-2017-AVI-126Multiples vulnérabilités dans Mozilla Firefox

.cve.org/CVERecord?id=CVE-2017-5450 Référence CVE CVE-2017-5451 https://www.cve.org/CVERecord?id=CVE-2017-5451 Référence CVE CVE-2017-5452 https://www.cve.org/CVERecord?id=CVE-2017-5452 Référence CVE CVE-2017-5453 https://www.cve.org/CVERecord?id=CVE-2017-5453 Référence CVE CVE-2017-5454 https://www.cve.org/CVERecord?id=CVE-2017-5454 Référence CVE CVE-2017-5455 https://www.cve.org/CVERecord?id=CVE-2017-5455 Référence CVE CVE-2017-5456 https://www.cve.org/CVERecord?id=CVE-2017-5456 Référence CVE CVE-2017-5458 https://www.cve.org/CVERecord?id=CVE-2017-5458 Référence CVE CVE-2017-5459 https://www.cve.org/CVERecord?id=CVE-2017-5459 Référence CVE CVE-2017-5460 https://www.cve.org/CVERecord?id=CVE-2017-5460 Référence CVE CVE-2017-5461 https://www.cve.org/CVERecord?id=CVE-2017-5461 Référence CVE CVE-2017-5462 https://www.cve.org/CVERecord?id=CVE-2017-5462 Référence CVE CVE-2017-5463 https://www.cve.org/CVERecord?id=CVE-2017-5463 Référence CVE CVE-2017-5464 https://www.cve.org/CVERecord?id=CVE-2017-5464 Référence CVE CVE-2017-5465 https://www.cve.org/CVERecord?id=CVE-2017-5465 Référence CVE CVE-2017-5466 https://www.cve.org/CVERecord?id=CVE-2017-5466 Référence CVE CVE-2017-5467 https://www.cve.org/CVERecord?id=CVE-2017-5467 Référence CVE CVE-2017-5468 https://www.cve.org/CVERecord?id=CVE-2017-5468 Ré

Official advisory ↗
JVN iPedia · Japanese · JVNDB-2017-013901Thunderbird および Firefox における解放済みメモリの使用に関する脆弱性

Thunderbird および Firefox には、解放済みメモリの使用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
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.
04

Evidence and provenance

Published 11 Jun 2018 · Last source change 5 Aug 2024, 15:04 UTC · CWE-416 · Use After Free

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-2017-14564
Product sourceCNA
Remediation sourceCVE/CNA references
CWE sourceNIST NVD
NVD statusNVD modified after enrichment

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

Material change intelligence

What changed after publication

View recent updates ↗
  1. ENISA EUVD mappingEUVD-2017-14564 was added to the official ENISA EUVD mapping for this CVE.
    Before
    not recorded
    After
    {"euvdId":"EUVD-2017-14564"}
    ENISA EUVD ↗
  2. Vendor guidanceAuthoritative vendor guidance changed: added patch: bugzilla.mozilla.org/show_bug.cgi?id=1343642; added remediation: bugzilla.mozilla.org/show_bug.cgi?id=1343642; removed vendor advisory: access.redhat.com/RHSA-2017:1104; removed vendor advisory: access.redhat.com/RHSA-2017:1106; 4 further additions; 2 further removals.
    Before
    vendor advisory: access.redhat.com/RHSA-2017:1104 · vendor advisory: access.redhat.com/RHSA-2017:1106 · vendor advisory: access.redhat.com/RHSA-2017:1201 · 1 more references
    After
    patch: bugzilla.mozilla.org/show_bug.cgi?id=1343642 · remediation: bugzilla.mozilla.org/show_bug.cgi?id=1343642 · vendor advisory: mozilla.org/mfsa2017-10 · 3 more references
    bugzilla.mozilla.org ↗
  3. Affected versionsThe structured affected or fixed version information changed.
    Before
    unspecified < 52.1; unspecified < 45.9; unspecified < 53 · Fixed: No fixed version is explicitly recorded in the structured CVE data.
    After
    unspecified < 52.1; unspecified < 45.9; unspecified < 53 · 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 ↗
  4. Remediation statusRemediation status changed from Awaiting fix to Patch available.
    Before
    Awaiting fix
    After
    Patch available
    bugzilla.mozilla.org ↗
  5. Public exploit evidencePublic exploit evidence changed from No public exploit to Public exploit reference.
    Before
    No public exploit
    After
    Public exploit reference
    bugzilla.mozilla.org ↗
  6. SeveritySeverity changed from Unknown to Critical.
    Before
    Unknown
    After
    Critical
    NIST NVD ↗
  7. CVSS scoreCVSS score changed from not recorded to 9.8 (CVSS 3.0 · NIST NVD · CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H).
    Before
    not recorded
    After
    9.8 (CVSS 3.0 · NIST NVD · CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H)
    NIST NVD ↗
  8. Catalogue recordCVE added to the BlackTree catalogue.
    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-2017-14564↗Vendor advisory↗Public exploit reference↗Vendor advisory↗Vendor advisory↗CVE authority or vendor reference · Red Hat RHSA-2017:1106↗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-2017-5460 · cve.blacktree.nl