CISA KEV · catalog date Jun 13, 2023 · first observed Jul 19, 2026
Evidence dossier
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, version 6.0.16 and below and…
Exploited in the wild (CISA KEV since Jun 13, 2023). NVD reports CVSS 3.1 9.8. EPSS estimates 85.7% exploit likelihood as of Aug 27, 2026.
As of Aug 27, 2026
Normalized restatement
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.
- State
- PUBLISHED
- Published
- Jun 13, 2023
- Updated
- Jul 31, 2026
- Evidence coverage
- 85%
Evidence chronology
What was known when
- Source dateFirst observed by CASCACISA KEVOriginal evidence ↗
Exploitation cataloged: Fortinet FortiOS and FortiProxy SSL-VPN Heap-Based Buffer Overflow Vulnerability
Inspect raw assertion
- Field
observed_exploitation- Value
- Fortinet FortiOS and FortiProxy SSL-VPN Heap-Based Buffer Overflow Vulnerability
- Source dateSource date omittedFirst observed by CASCACISA-ADPOriginal evidence ↗
Record text: CISA ADP Vulnrichment
Inspect raw assertion
- Field
container- Value
- CISA ADP Vulnrichment
- Source dateSource date omittedFirst observed by CASCACVE ProgramOriginal evidence ↗
Record text: CVE Program Container
Inspect raw assertion
- Field
container- Value
- CVE Program Container
- Source dateSource date omittedFirst observed by CASCAfortinetOriginal evidence ↗
Record text: 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.
Inspect raw assertion
- Field
container- Value
- 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.
- Source dateFirst observed by CASCAFIRST EPSSOriginal evidence ↗
EPSS score: 85.69% probability · 99.71th percentile
Inspect raw assertion
- Field
model_probability- Value
- Probability 0.856890000000; percentile 0.997080000000
FIRST EPSS · score date Aug 27, 2026 · 99.7th percentile · first observed Aug 27, 2026
NVD · CVSS 3.1 · first observed Aug 1, 2026 · same-version scores align in this snapshot
Evidence detail
Source limits and decisions
Why each evidence state has this value
casca-unknown-reasons-v1Eligible evidence is present for this bounded claim.
- Revision
- evidence-policy-v1.1.0
- Cutoff
- Aug 27, 2026
- Resolution
- None
Eligible evidence is present for this bounded claim.
- Revision
- evidence-policy-v1.1.0
- Cutoff
- Aug 27, 2026
- Resolution
- None
Eligible evidence is present for this bounded claim.
- Revision
- casca-direct-cvss-eligibility-v1
- Cutoff
- Aug 27, 2026
- Resolution
- None
The cited source assertion is retained while canonical product linkage remains open.
- Revision
- casca-factor-d-obligations-v1
- Cutoff
- Aug 27, 2026
- Resolution
- Resolve identity
Source comparison
Who said what
Fortinet FortiOS and FortiProxy SSL-VPN Heap-Based Buffer Overflow Vulnerability
Inspect raw assertion
- Field
observed_exploitation- Value
- Fortinet FortiOS and FortiProxy SSL-VPN Heap-Based Buffer Overflow Vulnerability
CISA ADP Vulnrichment
Inspect raw assertion
- Field
container- Value
- CISA ADP Vulnrichment
CVE Program Container
Inspect raw assertion
- Field
container- Value
- CVE Program Container
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.
Inspect raw assertion
- Field
container- Value
- 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.
85.69% probability · 99.71th percentile
Inspect raw assertion
- Field
model_probability- Value
- Probability 0.856890000000; percentile 0.997080000000
Applicability
Cited product scope
Grouped from 3 configuration nodes in this exact snapshot. Visual grouping is navigational; asset exposure and root cause require cited evidence.
Identity source boundaries
- Cpe dictionary1,775,266 records · observed through 2026-07-21T06:45:29.809Z
27d65b0f-b718-4b4f-bb79-c47c68d09dfa - Cpe match643,502 records · observed through 2026-07-21T08:13:17.697Z
955dae73-7302-438b-aee1-058d7cc5d48e
7 scope groups
Canonical linkage remains open; the cited source assertion is retained below.
Inspect raw assertion
[{"status": "affected", "version": "7.2.0", "versionType": "semver", "lessThanOrEqual": "7.2.4"}, {"status": "affected", "version": "7.0.0", "versionType": "semver", "lessThanOrEqual": "7.0.11"}, {"status": "affected", "version": "6.4.0", "versionType": "semver", "lessThanOrEqual": "6.4.12"}, {"status": "affected", "version": "6.2.0", "versionType": "semver", "lessThanOrEqual": "6.2.13"}, {"status": "affected", "version": "6.0.0", "versionType": "semver", "lessThanOrEqual": "6.0.16"}]Canonical linkage remains open; the cited source assertion is retained below.
Inspect raw assertion
[{"status": "affected", "version": "7.0.10"}, {"status": "affected", "version": "7.0.5"}, {"status": "affected", "version": "6.4.12"}, {"status": "affected", "version": "6.4.10"}, {"status": "affected", "version": "6.4.8"}, {"status": "affected", "version": "6.4.6"}, {"status": "affected", "version": "6.4.2"}, {"status": "affected", "version": "6.2.9", "versionType": "semver", "lessThanOrEqual": "6.2.13"}, {"status": "affected", "version": "6.2.6", "versionType": "semver", "lessThanOrEqual": "6.2.7"}, {"status": "affected", "version": "6.2.4"}, {"status": "affected", "version": "6.0.12", "versionType": "semver", "lessThanOrEqual": "6.0.16"}, {"status": "affected", "version": "6.0.10"}]Canonical linkage remains open; the cited source assertion is retained below.
Inspect raw assertion
[{"status": "affected", "version": "7.2.0", "versionType": "semver", "lessThanOrEqual": "7.2.3"}, {"status": "affected", "version": "7.0.0", "versionType": "semver", "lessThanOrEqual": "7.0.9"}, {"status": "affected", "version": "2.0.0", "versionType": "semver", "lessThanOrEqual": "2.0.12"}, {"status": "affected", "version": "1.2.0", "versionType": "semver", "lessThanOrEqual": "1.2.13"}, {"status": "affected", "version": "1.1.0", "versionType": "semver", "lessThanOrEqual": "1.1.6"}]product-b9768710ef226aef4b22c49bafc3f2c7b589c66b521ca9e6703daae7a3acb203Linked exactInspect raw assertion
cpe:2.3:h:fortinet:fortigate_6000:-:*:*:*:*:*:*:*- Official link
- Linked exact
- Role
- Environmental constraint
- Configuration
- 1 · node/1 · match 0
- Logic
- OR
- Version bounds
- No explicit bounds
- Match ID
3bb410c9-cdd4-4068-97e0-6d83ae62b7f1
product-5782e951e7d37984df9143b615aa3934866cfeee1ee5eb7170ae322a55ba91d2Linked exactInspect raw assertion
cpe:2.3:h:fortinet:fortigate_7000:-:*:*:*:*:*:*:*- Official link
- Linked exact
- Role
- Environmental constraint
- Configuration
- 1 · node/1 · match 1
- Logic
- OR
- Version bounds
- No explicit bounds
- Match ID
e0cba773-10c1-410d-bb01-771f454abeba
product-d06140244cc5e972beb67f7de823109a7332f0ff670c2c5c21938de936e3f496Linked exactInspect raw assertions
cpe:2.3:o:fortinet:fortios:*:*:*:*:*:*:*:*- Official link
- Linked exact
- Role
- Vulnerable target
- Configuration
- 1 · node/0 · match 1
- Logic
- OR
- Version bounds
- from including 6.2.9; through including 6.2.13
- Match ID
0a0d0d55-1a51-454d-a8b1-d7100d453102
cpe:2.3:o:fortinet:fortios:*:*:*:*:*:*:*:*- Official link
- Linked exact
- Role
- Vulnerable target
- Configuration
- 0 · node/0 · match 7
- Logic
- OR
- Version bounds
- from including 6.4.0; through including 6.4.12
- Match ID
5e99b6e5-7ec3-406c-afac-a5e32de266df
cpe:2.3:o:fortinet:fortios:6.4.2:*:*:*:*:*:*:*- Official link
- Linked exact
- Role
- Vulnerable target
- Configuration
- 1 · node/0 · match 6
- Logic
- OR
- Version bounds
- No explicit bounds
- Match ID
b28478da-8d10-4a8e-81ea-d3df421e5089
cpe:2.3:o:fortinet:fortios:6.0.10:*:*:*:*:*:*:*- Official link
- Linked exact
- Role
- Vulnerable target
- Configuration
- 1 · node/0 · match 2
- Logic
- OR
- Version bounds
- No explicit bounds
- Match ID
fa6af1fa-a034-439a-876b-bfa1be7de15e
cpe:2.3:o:fortinet:fortios:*:*:*:*:*:*:*:*- Official link
- Linked exact
- Role
- Vulnerable target
- Configuration
- 0 · node/0 · match 9
- Logic
- OR
- Version bounds
- from including 7.2.0; through including 7.2.4
- Match ID
4ab643a8-b52f-4d54-b816-28a6401baa25
cpe:2.3:o:fortinet:fortios:6.2.6:*:*:*:*:*:*:*- Official link
- Linked exact
- Role
- Vulnerable target
- Configuration
- 1 · node/0 · match 4
- Logic
- OR
- Version bounds
- No explicit bounds
- Match ID
2b8a132f-601f-4129-bfca-3a976a711d5a
cpe:2.3:o:fortinet:fortios:6.4.10:*:*:*:*:*:*:*- Official link
- Linked exact
- Role
- Vulnerable target
- Configuration
- 1 · node/0 · match 9
- Logic
- OR
- Version bounds
- No explicit bounds
- Match ID
eee44b20-6f00-4962-9929-5a5054bba94c
cpe:2.3:o:fortinet:fortios:6.4.8:*:*:*:*:*:*:*- Official link
- Linked exact
- Role
- Vulnerable target
- Configuration
- 1 · node/0 · match 8
- Logic
- OR
- Version bounds
- No explicit bounds
- Match ID
751d2fc7-482f-4c6b-95db-244004a2738e
cpe:2.3:o:fortinet:fortios:*:*:*:*:*:*:*:*- Official link
- Linked exact
- Role
- Vulnerable target
- Configuration
- 0 · node/0 · match 6
- Logic
- OR
- Version bounds
- from including 6.2.0; through including 6.2.13
- Match ID
3cd57a5a-2b13-495a-8530-8f97e1720602
cpe:2.3:o:fortinet:fortios:*:*:*:*:*:*:*:*- Official link
- Linked exact
- Role
- Vulnerable target
- Configuration
- 0 · node/0 · match 5
- Logic
- OR
- Version bounds
- from including 6.0.0; through including 6.0.16
- Match ID
8ea5512d-6ee5-4df3-a960-c02394f25225
cpe:2.3:o:fortinet:fortios:7.0.5:*:*:*:*:*:*:*- Official link
- Linked exact
- Role
- Vulnerable target
- Configuration
- 1 · node/0 · match 11
- Logic
- OR
- Version bounds
- No explicit bounds
- Match ID
48d0e8cc-3815-4697-86d0-dc7f66e70520
cpe:2.3:o:fortinet:fortios:*:*:*:*:*:*:*:*- Official link
- Linked exact
- Role
- Vulnerable target
- Configuration
- 0 · node/0 · match 8
- Logic
- OR
- Version bounds
- from including 7.0.0; through including 7.0.11
- Match ID
c2573c90-be6a-4d5d-a223-f09213318909
cpe:2.3:o:fortinet:fortios:6.4.12:*:*:*:*:*:*:*- Official link
- Linked exact
- Role
- Vulnerable target
- Configuration
- 1 · node/0 · match 10
- Logic
- OR
- Version bounds
- No explicit bounds
- Match ID
eb2ff1da-001b-4ca1-9f46-427d9c92cbc6
cpe:2.3:o:fortinet:fortios:7.0.10:*:*:*:*:*:*:*- Official link
- Linked exact
- Role
- Vulnerable target
- Configuration
- 1 · node/0 · match 12
- Logic
- OR
- Version bounds
- No explicit bounds
- Match ID
78c6c937-4477-438d-a252-e4102d758120
cpe:2.3:o:fortinet:fortios:6.2.7:*:*:*:*:*:*:*- Official link
- Linked exact
- Role
- Vulnerable target
- Configuration
- 1 · node/0 · match 5
- Logic
- OR
- Version bounds
- No explicit bounds
- Match ID
90600b14-07c4-455d-9fc1-17034d91b987
cpe:2.3:o:fortinet:fortios:*:*:*:*:*:*:*:*- Official link
- Linked exact
- Role
- Vulnerable target
- Configuration
- 1 · node/0 · match 0
- Logic
- OR
- Version bounds
- from including 6.0.12; through including 6.0.16
- Match ID
6d997493-24c2-4a78-9df0-6438e9415a3c
cpe:2.3:o:fortinet:fortios:6.4.6:*:*:*:*:*:*:*- Official link
- Linked exact
- Role
- Vulnerable target
- Configuration
- 1 · node/0 · match 7
- Logic
- OR
- Version bounds
- No explicit bounds
- Match ID
c2f935f9-5b6a-47c2-8f65-7a1e8bb061ff
cpe:2.3:o:fortinet:fortios:6.2.4:*:*:*:*:*:*:*- Official link
- Linked exact
- Role
- Vulnerable target
- Configuration
- 1 · node/0 · match 3
- Logic
- OR
- Version bounds
- No explicit bounds
- Match ID
9694fc0c-408a-4892-add1-f36f4bbbd9ef
product-53e2c632c140b04469e646fdc096d80536975303740dc515e32352dc87ed2607Linked exactInspect raw assertions
cpe:2.3:a:fortinet:fortiproxy:*:*:*:*:*:*:*:*- Official link
- Linked exact
- Role
- Vulnerable target
- Configuration
- 0 · node/0 · match 2
- Logic
- OR
- Version bounds
- from including 2.0.0; through including 2.0.12
- Match ID
7c1d5e6b-a23e-4a92-b53c-720afeb1b951
cpe:2.3:a:fortinet:fortiproxy:*:*:*:*:*:*:*:*- Official link
- Linked exact
- Role
- Vulnerable target
- Configuration
- 0 · node/0 · match 3
- Logic
- OR
- Version bounds
- from including 7.0.0; through including 7.0.9
- Match ID
dac18f7e-5242-4f36-bb42-fec33b3ac075
cpe:2.3:a:fortinet:fortiproxy:*:*:*:*:*:*:*:*- Official link
- Linked exact
- Role
- Vulnerable target
- Configuration
- 0 · node/0 · match 0
- Logic
- OR
- Version bounds
- from including 1.1.0; through including 1.1.6
- Match ID
e6bbf05f-4967-4a2e-a8f8-c2086097148b
cpe:2.3:a:fortinet:fortiproxy:*:*:*:*:*:*:*:*- Official link
- Linked exact
- Role
- Vulnerable target
- Configuration
- 0 · node/0 · match 4
- Logic
- OR
- Version bounds
- from including 7.2.0; through including 7.2.3
- Match ID
3a99ff48-370e-4d2a-b5cc-889ea21ab213
cpe:2.3:a:fortinet:fortiproxy:*:*:*:*:*:*:*:*- Official link
- Linked exact
- Role
- Vulnerable target
- Configuration
- 0 · node/0 · match 1
- Logic
- OR
- Version bounds
- from including 1.2.0; through including 1.2.13
- Match ID
33b84d9a-55e3-4146-a55a-acb507e61b05
Affected-product evidence
Accepted scope and product mapping
0 canonical links · 2 source-reported links
Canonical linkage remains open; the cited source assertion is retained below.
Vendor specified only by source · Product specified only by source
- Source class
- Direct cve affected
- Assertions
- 3
- Mapping revision
- cpe23-exact-mapping-v1
- Observed cutoff
- Aug 27, 2026
Retained assertion IDs
0b0a799e-9e9c-4f66-899c-51f17e3123091a74071c-c7e8-4f70-9b17-e03889bae6d68ecdc2b0-32bf-48aa-a670-a945fd27637cCanonical linkage remains open; the cited source assertion is retained below.
Vendor specified only by source · Product specified only by source
- Source class
- Nvd cpe vulnerable target
- Assertions
- 23
- Mapping revision
- cpe23-exact-mapping-v1
- Observed cutoff
- Aug 27, 2026
Retained assertion IDs
0dd79102-2dcc-4baf-b886-1a254e123ba117baaab2-e6c3-4cfa-831f-38c5208f05f619e96cd8-e606-4533-8150-e274b6ca0b8729e4213e-9ae1-41b8-9606-d6345a2538c832202d8b-ab27-4e6c-bdc0-7059783ce12d53f2ae8b-abec-4498-87e3-1a4730cb98f16bd1adeb-8409-4edd-af71-a0d2486cb2a47bacf703-eb6b-4384-a2f6-41978f6a938b875f79c3-a7b5-428b-b94d-84abf0d8d63692088527-69e8-403d-8721-ce5e4c0fea3f9a7b725e-4538-468c-8afb-0e756259849b9dd81fb2-e521-4c16-99fd-c4acddcbd869a34fb0f5-ae93-4952-863c-6e005e14a059a9b2d059-06b9-4f66-8fb7-e433b5435672b14046ed-b031-42fe-89e3-068239458c63ba0892cd-074d-46fa-b94f-1c9e4de1fb1bd0f621fb-0e3d-4f9f-ac9d-20eb320cb4bad5b46595-875e-4f09-a235-a1cf07ac02b9da919da0-e3be-4046-bbd3-e02b0a005510ea1558a5-31cd-438e-a3a6-ab019427913bedc4e395-7619-4a08-bdb7-a63affc49ef1f2301c5d-d8d1-4c47-9d37-4e82d4b8dbddf4375318-3b66-48ca-af98-5c4b44936d34Assessments
CVSS by origin
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:F/RL:X/RC:RDirect CVE/CNA normalized decisions
fortinet
CVSS 3.1 · Primary · Original assertion · rank 1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:F/RC:R- Validation
- Base mismatch
- Recomputed
- 9.8
- Decision reason
- Outside current scoring policy
- Policy
- casca-direct-cvss-eligibility-v1
Assessments are retained side by side under closed precedence. Cascade never averages CVSS.
Evidence boundaries
- KEV membership is authoritative for the catalog, not proof of exposure in any environment.
- EPSS is a dated model probability and not an individual-environment prediction.
- Affected or fixed status applies only to the exact cited product and version scope; remaining scope stays source-scoped.
- NVD-carried upstream facts remain derivative; independent corroboration requires a separately authored source.
- Only NVD metrics validated under the generation-bound calculator are Public Priority eligible; direct CVE record metrics remain display-only.
- NVD CVSS source eligibility is closed: NVD-authored, exact record-source, or registered same-CVE container origin; unmapped sources remain display-only.
- Core replay supports the active and immediately prior generation; retrospective valid-at replay is deferred.
- OSV aggregation and OSV-converted NVD material are not independent corroboration.
- Red Hat facts are vendor assertions for the exact supplied products.
- Nonmembership and not-yet-observed states are not proof of safety.