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CVE-2023-37209: A use-after-free condition existed in `NotifyOnHistoryReload` where a `LoadingSessionHistoryEntry` object was freed and a reference to that…

HighCVSS 8.8 · v3.1—No exploit Fix available

Noroxi assessment

Priority: Monitor (action score 35/100)

  • 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: 0.59% (FIRST EPSS).
  • Anyone who can reach it over the internet can trigger it. No account or password is required. A user must open a link or visit a page. No special conditions are required; it is repeatable.
  • Fixed version: firefox-esr (Alpine:v3.18) 115.0-r0; MozillaFirefox (openSUSE:Leap 15.4) 115.0-150200.152.93.1; MozillaFirefox-branding-SLE (openSUSE:Leap 15.4) 115-150200.9.13.1.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to firefox-esr (Alpine:v3.18) 115.0-r0; MozillaFirefox (openSUSE:Leap 15.4) 115.0-150200.152.93.1; MozillaFirefox-branding-SLE (openSUSE:Leap 15.4) 115-150200.9.13.1 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

A use-after-free condition existed in `NotifyOnHistoryReload` where a `LoadingSessionHistoryEntry` object was freed and a reference to that object remained. This resulted in a potentially exploitable condition when the reference to that object was later reused. This vulnerability affects Firefox < 115.

Published
Jul 5, 2023
Updated
Jun 17, 2026
EPSS
0.5% · 48th percentile

Report tools

JSON

Action score

35

Monitor

Low priority for now.

CVSS
35 / 40 · 8.8 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.5%

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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
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 115affected

Affected versions

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

  • mozilla firefoxbefore 115.0

Package-level exposure

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

EcosystemPackageAffected rangeFix
Alpine:v3.18firefox-esrbefore 115.0-r0115.0-r0
openSUSE:Leap 15.4MozillaFirefoxbefore 115.0-150200.152.93.1115.0-150200.152.93.1
openSUSE:Leap 15.4MozillaFirefox-branding-SLEbefore 115-150200.9.13.1115-150200.9.13.1
openSUSE:TumbleweedMozillaFirefoxbefore 115.0-1.1115.0-1.1
SUSE:Linux Enterprise High Performance Computing 15 SP1-LTSSMozillaFirefoxbefore 115.0-150000.150.91.1115.0-150000.150.91.1
SUSE:Linux Enterprise High Performance Computing 15 SP1-LTSSMozillaFirefox-branding-SLEbefore 115-150000.4.25.1115-150000.4.25.1
SUSE:Linux Enterprise Module for Desktop Applications 15 SP4MozillaFirefoxbefore 115.0-150200.152.93.1115.0-150200.152.93.1
SUSE:Linux Enterprise Module for Desktop Applications 15 SP4MozillaFirefox-branding-SLEbefore 115-150200.9.13.1115-150200.9.13.1
SUSE:OpenStack Cloud 9MozillaFirefoxbefore 115.0-112.165.1115.0-112.165.1
SUSE:OpenStack Cloud 9MozillaFirefox-branding-SLEbefore 115-35.12.2115-35.12.2

Same product

mozilla: all records

Other highest-scoring records for the same primary product.

  • CVE-2010-3765Mozilla Firefox 3.5.x through 3.5.14 and 3.6.x through 3.6.11, Thunderbird 3.1.6 before 3.1.6 and 3.0.x before 3.0.10, and SeaMonkey 2.x…KEV
    94Now
  • CVE-2019-11708Insufficient vetting of parameters passed with the Prompt:Open IPC message between child and parent processes can result in the…KEV
    87Now
  • CVE-2015-4495The PDF reader in Mozilla Firefox before 39.0.3, Firefox ESR 38.x before 38.1.1, and Firefox OS before 2.2 allows remote attackers to…KEV
    86Now

Published before and after this one in the same product

  • ← EarlierCVE-2023-37205Jul 5, 2023 · The use of RTL Arabic characters in the address bar may have allowed for URL spoofing.
    26Monitor
  • ← EarlierCVE-2023-37206Jul 5, 2023 · Uploading files which contain symlinks may have allowed an attacker to trick a user into submitting sensitive data to a malicious website.
    26Monitor
  • Later →CVE-2023-37210Jul 5, 2023 · A website could prevent a user from exiting full-screen mode via alert and prompt calls.
    26Monitor

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-esr115.0-r0 · Alpine:v3.18Package registry (OSV)
opensuse:MozillaFirefox115.0-150200.152.93.1 · openSUSE:Leap 15.4Package registry (OSV)
opensuse:MozillaFirefox-branding-SLE115-150200.9.13.1 · openSUSE:Leap 15.4Package registry (OSV)
suse:MozillaFirefox115.0-150000.150.91.1 · SUSE:Linux Enterprise High Performance Computing 15 SP1-LTSSPackage registry (OSV)
suse:MozillaFirefox115.0-150200.152.93.1 · SUSE:Linux Enterprise Module for Desktop Applications 15 SP4Package registry (OSV)
suse:MozillaFirefox-branding-SLE115-150000.4.25.1 · SUSE:Linux Enterprise High Performance Computing 15 SP1-LTSSPackage registry (OSV)
suse:MozillaFirefox-branding-SLE115-150200.9.13.1 · SUSE:Linux Enterprise Module for Desktop Applications 15 SP4Package 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.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

All national notices →

Not on record for this CVE: EPSS history · patch commit or PR link · 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.
  • A user must open a link or visit a page.
  • 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
Required
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

CWE-416 · Use After Free

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

nvd-primary

Root cause

After a memory region is freed, another reference pointing to it is still used. By then, the same region may have been allocated for different data.

The bug in code

The whole CWE-416 class

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

Vulnerable

c
free(dev->buf);/* ... another thread is still running ... */process(dev->buf);

Fixed

c
lock(&dev->lock);free(dev->buf);dev->buf = NULL;unlock(&dev->lock);

Attack context

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

MITRE has no CAPEC/ATT&CK mapping for this CWE.

References

Show all references (2 more)

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

All records