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NVD / CVE Program· CNA mozilla

CVE-2016-9893: Memory safety bugs were reported in Thunderbird 45.5.

CriticalCVSS 9.8 · v3.0—No exploit Fix available

Noroxi assessment

Priority: Plan (action score 40/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 2.5% (FIRST EPSS); higher than 85.3% of all records.
  • Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: firefox-esr (Alpine:v3.4) 45.6.0; firefox-esr (Debian:12) 45.6.0esr-1; firefox-esr (Debian:7) 45.6.0esr-1~deb7u1.

Add it to your regular patch cycle. Upgrade to firefox-esr (Alpine:v3.4) 45.6.0; firefox-esr (Debian:12) 45.6.0esr-1; firefox-esr (Debian:7) 45.6.0esr-1~deb7u1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

Memory safety bugs were reported in Thunderbird 45.5. Some of these bugs showed evidence of memory corruption and we presume that with enough effort that some of these could be exploited to run arbitrary code. This vulnerability affects Firefox < 50.1, Firefox ESR < 45.6, and Thunderbird < 45.6.

Published
Jun 11, 2018
Updated
Jun 16, 2026
EPSS
2.5% · 85th percentile

Report tools

JSON

Action score

40

Plan

Add it to your regular patch cycle.

CVSS
39 / 40 · 9.8 / 10
CISA KEV
0 / 30 · Not listed
EPSS
1 / 30 · 2.5%

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

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  • when exploit code appears or is weaponized
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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
debiandebian linux
redhatenterprise linux
redhatenterprise linux desktop
redhatenterprise linux server
redhatenterprise linux server aus
redhatenterprise linux server eus
redhatenterprise linux workstation
mozillathunderbird
mozillafirefox

Versions reported by the vendor

Affected version ranges reported by the assigning authority (mozilla). Independent of NVD's CPE analysis and usually ahead of it.

  • Mozilla Firefox

    • unspecified and later · before 50.1affected

  • Mozilla Firefox ESR

    • unspecified and later · before 45.6affected

  • Mozilla Thunderbird

    • unspecified and later · before 45.6affected
Affected versions · NVD (20)

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • debian debian linux9.0
  • mozilla firefoxbefore 45.6.0
  • mozilla firefoxbefore 50.1
  • mozilla thunderbirdbefore 45.6.0
  • redhat enterprise linux5.0
  • redhat enterprise linux6.0
  • redhat enterprise linux7.0
  • redhat enterprise linux desktop5.0
  • redhat enterprise linux desktop6.0
  • redhat enterprise linux desktop7.0
  • redhat enterprise linux server5.0
  • redhat enterprise linux server6.0
  • redhat enterprise linux server7.0
  • redhat enterprise linux server aus7.3
  • redhat enterprise linux server aus7.4
  • redhat enterprise linux server eus7.3
  • redhat enterprise linux server eus7.4
  • redhat enterprise linux server eus7.5
  • redhat enterprise linux workstation5.0
  • redhat enterprise linux workstation6.0

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Alpine:v3.4firefox-esrbefore 45.6.045.6.0
Debian:12firefox-esrbefore 45.6.0esr-145.6.0esr-1
Debian:7firefox-esrbefore 45.6.0esr-1~deb7u145.6.0esr-1~deb7u1
Debian:7icedovebefore 1:45.6.0-2~deb7u11:45.6.0-2~deb7u1
Debian:8firefox-esrbefore 45.6.0esr-1~deb8u145.6.0esr-1~deb8u1
Debian:8icedovebefore 1:45.6.0-1~deb8u11:45.6.0-1~deb8u1
Red Hat:enterprise_linux:5::clientfirefoxbefore 0:45.6.0-1.el5_110:45.6.0-1.el5_11
Red Hat:enterprise_linux:5::clientfirefox-debuginfobefore 0:45.6.0-1.el5_110:45.6.0-1.el5_11
Red Hat:enterprise_linux:5::clientthunderbirdbefore 0:45.6.0-1.el5_110:45.6.0-1.el5_11
Red Hat:enterprise_linux:5::clientthunderbird-debuginfobefore 0:45.6.0-1.el5_110:45.6.0-1.el5_11
Red Hat:enterprise_linux:6::clientfirefoxbefore 0:45.6.0-1.el6_80:45.6.0-1.el6_8
Red Hat:enterprise_linux:6::clientfirefox-debuginfobefore 0:45.6.0-1.el6_80:45.6.0-1.el6_8
Red Hat:enterprise_linux:6::clientthunderbirdbefore 0:45.6.0-1.el6_80:45.6.0-1.el6_8
Red Hat:enterprise_linux:6::clientthunderbird-debuginfobefore 0:45.6.0-1.el6_80:45.6.0-1.el6_8
Red Hat:enterprise_linux:7::clientfirefoxbefore 0:45.6.0-1.el7_30:45.6.0-1.el7_3
Red Hat:enterprise_linux:7::clientfirefox-debuginfobefore 0:45.6.0-1.el7_30:45.6.0-1.el7_3
Red Hat:enterprise_linux:7::clientthunderbirdbefore 0:45.6.0-1.el7_30:45.6.0-1.el7_3
Red Hat:enterprise_linux:7::clientthunderbird-debuginfobefore 0:45.6.0-1.el7_30:45.6.0-1.el7_3
SUSE:Linux Enterprise Desktop 12 SP1MozillaFirefoxbefore 45.6.0esr-96.145.6.0esr-96.1
SUSE:Linux Enterprise Server 11 SP2-LTSSMozillaFirefoxbefore 45.6.0esr-66.145.6.0esr-66.1
SUSE:Linux Enterprise Software Development Kit 11 SP4MozillaFirefoxbefore 45.6.0esr-62.145.6.0esr-62.1
SUSE:Package Hub 12MozillaThunderbirdbefore 45.6.0-20.145.6.0-20.1

Same product

debian: all records

Other highest-scoring records for the same primary product.

  • CVE-2016-9079A use-after-free vulnerability in SVG Animation has been discovered.KEV
    86Now
  • CVE-2024-44308The issue was addressed with improved checks.KEV
    68This week
  • CVE-2021-25216A second vulnerability in BIND's GSSAPI security policy negotiation can be targeted by a buffer overflow attack
    64This week

Published before and after this one in the same product

  • ← EarlierCVE-2018-1000301May 24, 2018 · curl version curl 7.20.0 to and including curl 7.59.0 contains a CWE-126: Buffer Over-read vulnerability in denial of service that can…
    38Monitor
  • ← EarlierCVE-2018-11235May 30, 2018 · In Git before 2.13.7, 2.14.x before 2.14.4, 2.15.x before 2.15.2, 2.16.x before 2.16.4, and 2.17.x before 2.17.1, remote code execution can…
    45Plan
  • Later →CVE-2016-9895Jun 11, 2018 · Event handlers on "marquee" elements were executed despite a strict Content Security Policy (CSP) that disallowed inline JavaScript.
    25Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
alpine:firefox-esr45.6.0 · Alpine:v3.4Package registry (OSV)
debian:firefox-esr45.6.0esr-1 · Debian:12Package registry (OSV)
debian:icedove1:45.6.0-2~deb7u1 · Debian:7Package registry (OSV)
red hat:firefox0:45.6.0-1.el5_11 · Red Hat:enterprise_linux:5::clientPackage registry (OSV)
red hat:firefox-debuginfo0:45.6.0-1.el5_11 · Red Hat:enterprise_linux:5::clientPackage registry (OSV)
red hat:thunderbird0:45.6.0-1.el5_11 · Red Hat:enterprise_linux:5::clientPackage registry (OSV)
red hat:thunderbird-debuginfo0:45.6.0-1.el5_11 · Red Hat:enterprise_linux:5::clientPackage registry (OSV)
suse:MozillaFirefox45.6.0esr-62.1 · SUSE:Linux Enterprise Software Development Kit 11 SP4Package registry (OSV)
suse:MozillaThunderbird45.6.0-20.1 · SUSE:Package Hub 12Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

Not on record for this CVE: EPSS history · patch commit or PR link · researcher credit · variant or chain candidate · public bounty program.

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

CWE-119 · Improper Restriction of Operations within the Bounds of a Memory Buffer

CVSS vector

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

ATT&CK techniques

—

References

Show all references (9 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records