The Portable Document Format (PDF) specification does not provide any information regarding the concrete procedure of how to validate signatures
Published Jan 7, 2021
5.3
MEDIUMCVSS 3.1
EPSS 1.13%
Description
The Portable Document Format (PDF) specification does not provide any information regarding the concrete procedure of how to validate signatures. Consequently, an Incremental Saving vulnerability exists in multiple products. When an attacker uses the Incremental Saving feature to add pages or annotations, Body Updates are displayed to the user without any action by the signature-validation logic. This affects Foxit Reader before 9.4 and PhantomPDF before 8.3.9 and 9.x before 9.4. It also affects LibreOffice, Master PDF Editor, Nitro Pro, Nitro Reader, Nuance Power PDF Standard, PDF Editor 6 Pro, PDFelement6 Pro, PDF Studio Viewer 2018, PDF Studio Pro, Perfect PDF 10 Premium, and Perfect PDF Reader.
Affected products
No data.
Configuration 1
- 5.1.12
- 5.1.68
- 9.4
- ≥ 9.0 · < 9.4
- 8.3.9
- 11.0.3.173
- 5.5.9.2
- 6.4.2.3521
- 6.8.0.3523
- 6.8.4.3921
- 6.0.6.2
- 6.1.3.2
- 3.0.0.17
- 3.0.0.30
- 7.0
- 12.0.7
- 2018.0.1
- 2018.2.0
- 10.0.0.1
- 13.0.3
- 13.1.5
Configuration 2
- 5.1.12
- 5.1.68
- 9.1.0
- 9.2.0
- 6.0.6.2
- 6.1.3.2
- 12.0.7
- 2018.0.1
- 2018.2.0
Running on/with
- n/a
Configuration 3
- 5.1.24
- 5.1.68
- 9.1.0
- 9.2.0
- 6.6.2.3315
- 6.7.6.3399
- 6.7.1.3355
- 6.7.6.3399
- 6.1.0.3
- 6.1.3.2
- 12.0.7
- 2018.0.1
- 2018.2.0
No data.
No Red Hat product state for this CVE.
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
No CVSS v3.0 score for this CVE.
AV:N/AC:L/Au:N/C:P/I:N/A:N
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
Score over time
2021–2026- EPSS v1
- EPSS v5
- EPSS v2
- EPSS v3
- EPSS v4
Percentile over time
- EPSS v1
- EPSS v5
- EPSS v2
- EPSS v3
- EPSS v4
Table of values (11 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 1.13% (0.01133) | 65.24th | v5 (v2026.06.15) |
| Jun 15, 2026 | 1.13% (0.01133) | 62.13th | v5 (v2026.06.15) |
| Mar 17, 2025 | 0.01% (0.00007) | 0.31th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.18% (0.00176) | 56.04th | v3 (v2023.03.01) |
| Sep 23, 2023 | 0.18% (0.00176) | 54.33th | v3 (v2023.03.01) |
| Sep 3, 2023 | 0.15% (0.00155) | 51.16th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.12% (0.00117) | 43.98th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.02% (0.01018) | 40.69th | v2 (v2022.01.01) |
| Feb 4, 2022 | 1.02% (0.01018) | 19.50th | v2 (v2022.01.01) |
| Feb 3, 2022 | 1.73% (0.01726) | 34.95th | v5 (v2026.06.15) |
| Apr 14, 2021 | 1.73% (0.01726) | 0.00th | v1 |
References (4)
- https://pdf-insecurity.org/signature/evaluation_2018.html x_refsource_MISCThird Party Advisory
- https://pdf-insecurity.org/signature/signature.html x_refsource_MISCThird Party Advisory
- https://www.foxitsoftware.com/support/security-bulletins.php x_refsource_CONFIRMVendor Advisory
- https://www.pdfa.org/recently-identified-pdf-digital-signature-vulnerabilities/ x_refsource_MISCThird Party Advisory
| Link | Providers | Tags |
|---|---|---|
| https://pdf-insecurity.org/signature/evaluation_2018.html | x_refsource_MISCThird Party Advisory | |
| https://pdf-insecurity.org/signature/signature.html | x_refsource_MISCThird Party Advisory | |
| https://www.foxitsoftware.com/support/security-bulletins.php | x_refsource_CONFIRMVendor Advisory | |
| https://www.pdfa.org/recently-identified-pdf-digital-signature-vulnerabilities/ | x_refsource_MISCThird Party Advisory |
Change history (0)
No recorded changes yet.