Prototype Pollution
Published Nov 16, 2020
5.6
MEDIUMCVSS 3.1
EPSS 0.57%
Description
This affects the package @firebase/util before 0.3.4. This vulnerability relates to the deepExtend function within the DeepCopy.ts file. Depending on if user input is provided, an attacker can overwrite and pollute the object prototype of a program.
Affected products
No data.
- < 0.3.4
No data.
No Red Hat product state for this CVE.
@firebase/util
npm
Introduced 0 Fixed 0.3.4
| Ecosystem | Package | Introduced | Fixed |
|---|---|---|---|
| npm | @firebase/util | 0 | 0.3.4 |
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:N/I:L/A:N
1 other source (CVE.org) ▾
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L/E:P/RL:O/RC:C
No CVSS v3.0 score for this CVE.
AV:N/AC:L/Au:N/C:N/I:P/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 4, 2026.
Score over time
2021-2026- EPSS v1
- EPSS v5
- EPSS v2
- EPSS v3
Percentile over time
- EPSS v1
- EPSS v5
- EPSS v2
- EPSS v3
Table of values (12 key points)
Flat stretches are collapsed. Showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 4, 2026 | 0.57% (0.00569) | 45.17th | v5 (v2026.06.15) |
| Sep 20, 2026 | 0.57% (0.00569) | 45.87th | v5 (v2026.06.15) |
| Jul 20, 2024 | 0.11% (0.00108) | 44.08th | v3 (v2023.03.01) |
| Sep 3, 2023 | 0.11% (0.00108) | 42.83th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.09% (0.00092) | 37.82th | v3 (v2023.03.01) |
| Mar 6, 2023 | 0.95% (0.00954) | 36.37th | v2 (v2022.01.01) |
| Apr 1, 2022 | 0.95% (0.00954) | 32.50th | v2 (v2022.01.01) |
| Feb 4, 2022 | 5.74% (0.05736) | 77.22th | v2 (v2022.01.01) |
| Feb 3, 2022 | 1.52% (0.01525) | 33.42th | v1 |
| Jan 6, 2022 | 1.52% (0.01525) | 32.72th | v1 |
| Jan 5, 2022 | 0.34% (0.00344) | 7.35th | v5 (v2026.06.15) |
| Apr 14, 2021 | 0.34% (0.00344) | 0.00th | v1 |
References (5)
- https://github.com/advisories/GHSA-fpm5-vv97-jfwg Advisory
- https://github.com/firebase/firebase-js-sdk/commit/9cf727fcc3d049551b16ae0698ac33dc2fe45ada x_refsource_MISCPatchThird Party Advisory
- https://github.com/firebase/firebase-js-sdk/pull/4001 x_refsource_MISCPatchThird Party Advisory
- https://nvd.nist.gov/vuln/detail/CVE-2020-7765
- https://snyk.io/vuln/SNYK-JS-FIREBASEUTIL-1038324 x_refsource_MISCExploitThird Party Advisory
| Link | Providers | Tags |
|---|---|---|
| https://github.com/advisories/GHSA-fpm5-vv97-jfwg | Advisory | |
| https://github.com/firebase/firebase-js-sdk/commit/9cf727fcc3d049551b16ae0698ac33dc2fe45ada | x_refsource_MISCPatchThird Party Advisory | |
| https://github.com/firebase/firebase-js-sdk/pull/4001 | x_refsource_MISCPatchThird Party Advisory | |
| https://nvd.nist.gov/vuln/detail/CVE-2020-7765 | ||
| https://snyk.io/vuln/SNYK-JS-FIREBASEUTIL-1038324 | x_refsource_MISCExploitThird Party Advisory |
Change history (0)
No recorded changes yet.