Skip to content
Noroxi
NVD / CVE Program· CNA fortinet

CVE-2023-27997: A heap-based buffer overflow vulnerability [CWE-122] in FortiOS version 7.2.4 and below, version 7.0.11 and below, version 6.4.12 and below,

Noroxi assessment

Priority: Now (action score 95/100)

  • CISA has confirmed exploitation in the wild (Jun 13, 2023); it is known to be used in ransomware campaigns. Remediation deadline for US federal agencies: Jul 4, 2023.
  • Probability of exploitation in the next 30 days: 85.6% (FIRST EPSS); higher than 99.7% 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.
  • According to CISA the attack is automatable: targets can be found by mass scanning.
  • According to the record, no fixed version is available yet.
  • Mentioned 3 times in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Patch today or shut off access. Until a fix is released, restrict access to the affected component and follow the vendor's advisory.

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 · CISA KEV · FIRST EPSS

A heap-based buffer overflow vulnerability [CWE-122] in FortiOS version 7.2.4 and below, version 7.0.11 and below, version 6.4.12 and below, version 6.0.16 and below and FortiProxy version 7.2.3 and below, version 7.0.9 and below, version 2.0.12 and below, version 1.2 all versions, version 1.1 all versions SSL-VPN may allow a remote attacker to execute arbitrary code or commands via specifically crafted requests.

CriticalCVSS 9.8 · v3.1KEVWeaponized No fix recorded
Published
Jun 13, 2023
Updated
Jul 31, 2026
EPSS
85.6% · 99th percentile

Report tools

JSON

Action score

95

Now

Patch today or shut off access.

CVSS
39 / 40 · 9.8 / 10
CISA KEV
30 / 30 · Listed
EPSS
26 / 30 · 85.6%

CISA SSVC decision

Exploitation
active
Automatable
yes
Technical impact
total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
9.8
CNA · fortinet
9.2
0.6 point gap

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:F/RL:X/RC:R

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Actively exploited in the wild

CISA added this to its Known Exploited Vulnerabilities catalog on Jun 13, 2023. That signals real attacks, not theory.

Remediation deadline for US federal agencies: Jul 4, 2023.

Known to be used in ransomware campaigns.

Get told when this record changes

  • In CISA KEV: exploitation in the wild confirmed
  • Weaponized exploit exists
  • No fixed version yet

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2023-27997

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

One daily email digest (06:00 UTC); connect a webhook for KEV listings and weaponized exploits instantly.

Your free account also gets you

Running WordPress? Scan your site free with WP Lens

  • Stack alerts: add the products and versions you run, get the new CVEs that affect them
  • Uptime monitoring: 1 site, instant email when it goes down
  • Add your domain: subdomains and takeover risk scanned every week (1 domain)
  • 10 scans an hour on the security tools (3 a day without an account), an API key and MCP
  • All your scans in one panel: findings, what changed in the last scan, a report per domain or per client (PDF, share link)
All free tools

Sign up with email · Have an account? Sign in

Free account, no card. Unfollow any time.

Don't want an account? Get "Exploited this week" by email every MondayDon't want an account? RSS feed for fortinet records

Running WordPress? Scan your site free with WP Lens

Is your version affected? Check it

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.

We use this product, ask for help

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
fortinetfortiproxy
fortinetfortios
fortinetfortigate 6000
fortinetfortigate 7000

Affected versions

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

  • fortinet fortios6.0.0 and later · up to 6.0.16 inclusive
  • fortinet fortios6.2.0 and later · up to 6.2.13 inclusive
  • fortinet fortios6.4.0 and later · up to 6.4.12 inclusive
  • fortinet fortios7.0.0 and later · up to 7.0.11 inclusive
  • fortinet fortios7.2.0 and later · up to 7.2.4 inclusive
  • fortinet fortios6.0.12 and later · up to 6.0.16 inclusive
  • fortinet fortios6.2.9 and later · up to 6.2.13 inclusive
  • fortinet fortios6.0.10
  • fortinet fortios6.2.4
  • fortinet fortios6.2.6
  • fortinet fortios6.2.7
  • fortinet fortios6.4.10
  • fortinet fortios6.4.12
  • fortinet fortios6.4.2
  • fortinet fortios6.4.6
  • fortinet fortios6.4.8
  • fortinet fortios7.0.10
  • fortinet fortios7.0.5

Versions reported by the vendor

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

  • Fortinet FortiOS

    • 7.2.0 and later · up to and including 7.2.4affected · semver
    • 7.0.0 and later · up to and including 7.0.11affected · semver
    • 6.4.0 and later · up to and including 6.4.12affected · semver
    • 6.2.0 and later · up to and including 6.2.13affected · semver
    • 6.0.0 and later · up to and including 6.0.16affected · semver

  • Fortinet FortiOS-6K7K

    • 7.0.10, 7.0.5, 6.4.12, 6.4.10, 6.4.8, 6.4.6, 6.4.2, 6.2.4, 6.0.10affected
    • 6.2.9 and later · up to and including 6.2.13affected · semver
    • 6.2.6 and later · up to and including 6.2.7affected · semver
    • 6.0.12 and later · up to and including 6.0.16affected · semver

  • Fortinet FortiProxy

    • 7.2.0 and later · up to and including 7.2.3affected · semver
    • 7.0.0 and later · up to and including 7.0.9affected · semver
    • 2.0.0 and later · up to and including 2.0.12affected · semver
    • 1.2.0 and later · up to and including 1.2.13affected · semver
    • 1.1.0 and later · up to and including 1.1.6affected · semver

Same product

fortinet: all records

Other highest-scoring records for the same primary product.

  • CVE-2022-40684An authentication bypass using an alternate path or channel [CWE-288] in Fortinet FortiOS version 7.2.0 through 7.2.1 and 7.0.0 through 7.0.KEV
    99Now
  • CVE-2018-13379An Improper Limitation of a Pathname to a Restricted Directory ("Path Traversal") in Fortinet FortiOS 6.0.0 to 6.0.4, 5.6.3 to 5.6.7 and 5.4KEV
    99Now
  • CVE-2024-55591An Authentication Bypass Using an Alternate Path or Channel vulnerability [CWE-288] affecting FortiOS version 7.0.0 through 7.0.16 and FortiKEV
    97Now

Published before and after this one in the same product

  • ← EarlierCVE-2023-22639Jun 13, 2023 · A out-of-bounds write in Fortinet FortiOS version 7.2.0 through 7.2.3, FortiOS version 7.0.0 through 7.0.10, FortiOS version 6.4.0 through 6
    31Monitor
  • ← EarlierCVE-2023-26207Jun 13, 2023 · An insertion of sensitive information into log file vulnerability in Fortinet FortiOS 7.2.0 through 7.2.4 and FortiProxy 7.0.0 through 7.0.1
    26Monitor
  • Later →CVE-2023-29175Jun 13, 2023 · An improper certificate validation vulnerability [CWE-295] in FortiOS 6.2 all versions, 6.4 all versions, 7.0.0 through 7.0.10, 7.2.0 and Fo
    19Monitor

Remediation

Which version to upgrade to

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

No fix version is recorded for this entry. Check the references for vendor advisories.

Exploit status

Weaponized

A ready exploit tool or active in-the-wild use is known for this vulnerability. This should be your top priority.

Evidence

  • Proof-of-concept repository on GitHub ×12

Noroxi does not host or link to exploit code. Metasploit module names and Nuclei template ids are shown (names, not code); Exploit-DB entries and PoC repositories are given as counts only.

Public exploit evidence
SourceKindDate
Proof-of-concept repository on GitHubstars:272023-06-16
Proof-of-concept repository on GitHubstars:1342023-06-16
Proof-of-concept repository on GitHubstars:12023-06-22
Proof-of-concept repository on GitHubstars:02023-06-23
Proof-of-concept repository on GitHubstars:22023-07-11
Proof-of-concept repository on GitHubstars:02023-09-03
Proof-of-concept repository on GitHubstars:632023-10-12
Proof-of-concept repository on GitHubstars:92023-10-12
Proof-of-concept repository on GitHubstars:02024-11-14
Proof-of-concept repository on GitHubstars:02025-04-18
Proof-of-concept repository on GitHubstars:22026-07-31
Proof-of-concept repository on GitHubstars:12026-09-01

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.

  1. CISA KEVsame day
  2. Published
  3. First PoC+3 d
  4. TodayNov 4, 2026+1241 d

No history yet (it accumulates with the daily EPSS job).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

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

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

National notice (Türkiye Cybersecurity Directorate / USOM)

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

All national notices →

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-122 · Heap-based Buffer Overflow

CVSS vector

CVSS:3.1/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

—

Change log

No changes recorded on tracked fields yet. Score, KEV, exploit maturity and fix status changes appear here.

References

Show all references (1 more)

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

All records