CVE-2020-12400: When converting coordinates from projective to affine, the modular inversion was not performed in constant time, resulting in a possible…
Noroxi assessment
Priority: Monitor (action score 18/100)
- 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: 0.27% (FIRST EPSS).
- Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. Special conditions such as timing or configuration are required.
- Fixed version: firefox (Alpine:v3.12) 80.0-r0; nss (Alpine:v3.12) 3.55-r0; librewolf (Alpine:v3.21) 80.0-r0.
Low priority for now. Upgrade to firefox (Alpine:v3.12) 80.0-r0; nss (Alpine:v3.12) 3.55-r0; librewolf (Alpine:v3.21) 80.0-r0 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
When converting coordinates from projective to affine, the modular inversion was not performed in constant time, resulting in a possible timing-based side channel attack. This vulnerability affects Firefox < 80 and Firefox for Android < 80.
- Published
- Oct 8, 2020
- Updated
- Aug 19, 2026
- EPSS
- 0.2% · 19th percentile
- CWE
- CWE-203
Report tools
Action score
18
Low priority for now.
- CVSS
- 18 / 40 · 4.7 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 0 / 30 · 0.2%
Get told when this record changes
- Not in KEV: no record of exploitation in the wild
- No public exploit code on record
- A fix has been released
If any of these changes, we'll tell you in the daily email digest.
Is your version affected? Check itNoroxi 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 helpAffected 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.
| Vendor | Product | CPE |
|---|---|---|
| mozilla | firefox | cpe:2.3:a:mozilla:firefox |
| mozilla | firefox mobile | cpe:2.3:a:mozilla:firefox_mobile |
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 80affected
Mozilla Firefox for Android
- unspecified and later · before 80affected
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- mozilla firefoxbefore 80.0
- mozilla firefox mobilebefore 80.0
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| Alpine:v3.12 | firefox | before 80.0-r0 | 80.0-r0 |
| Alpine:v3.12 | nss | before 3.55-r0 | 3.55-r0 |
| Alpine:v3.21 | librewolf | before 80.0-r0 | 80.0-r0 |
| Debian:10 | nss | before 2:3.42.1-1+deb10u6 | 2:3.42.1-1+deb10u6 |
| Debian:12 | nss | before 2:3.55-1 | 2:3.55-1 |
| Debian:9 | nss | before 2:3.26.2-1.1+deb9u2 | 2:3.26.2-1.1+deb9u2 |
| Red Hat:enterprise_linux:7::client | nspr | before 0:4.25.0-2.el7_9 | 0:4.25.0-2.el7_9 |
| Red Hat:enterprise_linux:7::client | nspr-debuginfo | before 0:4.25.0-2.el7_9 | 0:4.25.0-2.el7_9 |
| Red Hat:enterprise_linux:7::client | nspr-devel | before 0:4.25.0-2.el7_9 | 0:4.25.0-2.el7_9 |
| Red Hat:enterprise_linux:7::client | nss | before 0:3.53.1-3.el7_9 | 0:3.53.1-3.el7_9 |
| Red Hat:enterprise_linux:7::client | nss-debuginfo | before 0:3.53.1-3.el7_9 | 0:3.53.1-3.el7_9 |
| Red Hat:enterprise_linux:7::client | nss-devel | before 0:3.53.1-3.el7_9 | 0:3.53.1-3.el7_9 |
| Red Hat:enterprise_linux:7::client | nss-pkcs11-devel | before 0:3.53.1-3.el7_9 | 0:3.53.1-3.el7_9 |
| Red Hat:enterprise_linux:7::client | nss-softokn | before 0:3.53.1-6.el7_9 | 0:3.53.1-6.el7_9 |
| Red Hat:enterprise_linux:7::client | nss-softokn-debuginfo | before 0:3.53.1-6.el7_9 | 0:3.53.1-6.el7_9 |
| Red Hat:enterprise_linux:7::client | nss-softokn-devel | before 0:3.53.1-6.el7_9 | 0:3.53.1-6.el7_9 |
| Red Hat:enterprise_linux:7::client | nss-softokn-freebl | before 0:3.53.1-6.el7_9 | 0:3.53.1-6.el7_9 |
| Red Hat:enterprise_linux:7::client | nss-softokn-freebl-devel | before 0:3.53.1-6.el7_9 | 0:3.53.1-6.el7_9 |
| Red Hat:enterprise_linux:7::client | nss-sysinit | before 0:3.53.1-3.el7_9 | 0:3.53.1-3.el7_9 |
| Red Hat:enterprise_linux:7::client | nss-tools | before 0:3.53.1-3.el7_9 | 0:3.53.1-3.el7_9 |
| Red Hat:enterprise_linux:7::client | nss-util | before 0:3.53.1-1.el7_9 | 0:3.53.1-1.el7_9 |
| Red Hat:enterprise_linux:7::client | nss-util-debuginfo | before 0:3.53.1-1.el7_9 | 0:3.53.1-1.el7_9 |
| Red Hat:enterprise_linux:7::client | nss-util-devel | before 0:3.53.1-1.el7_9 | 0:3.53.1-1.el7_9 |
| Red Hat:enterprise_linux:8::appstream | nss | before 0:3.53.1-17.el8_3 | 0:3.53.1-17.el8_3 |
+23
Same product
mozilla: all recordsOther 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…KEV94Now
- CVE-2019-11708Insufficient vetting of parameters passed with the Prompt:Open IPC message between child and parent processes can result in the…KEV87Now
- 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…KEV86Now
Published before and after this one in the same product
- ← EarlierCVE-2020-15677Oct 1, 2020 · By exploiting an Open Redirect vulnerability on a website, an attacker could have spoofed the site displayed in the download file dialog to…24Monitor
- ← EarlierCVE-2020-15678Oct 1, 2020 · When recursing through graphical layers while scrolling, an iterator may have become invalid, resulting in a potential use-after-free.36Monitor
- Later →CVE-2020-12401Oct 8, 2020 · During ECDSA signature generation, padding applied in the nonce designed to ensure constant-time scalar multiplication was removed…18Monitor
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
| Product / package | Fixed version | Source |
|---|---|---|
| alpine:firefox | 80.0-r0 · Alpine:v3.12 | Package registry (OSV) |
| alpine:librewolf | 80.0-r0 · Alpine:v3.21 | Package registry (OSV) |
| alpine:nss | 3.55-r0 · Alpine:v3.12 | Package registry (OSV) |
| debian:nss | 2:3.55-1 · Debian:12 | Package registry (OSV) |
| red hat:nspr | 0:4.25.0-2.el7_9 · Red Hat:enterprise_linux:7::client | Package registry (OSV) |
| red hat:nspr-debuginfo | 0:4.25.0-2.el7_9 · Red Hat:enterprise_linux:7::client | Package registry (OSV) |
| red hat:nspr-devel | 0:4.25.0-2.el7_9 · Red Hat:enterprise_linux:7::client | Package registry (OSV) |
| red hat:nss | 0:3.53.1-3.el7_9 · Red Hat:enterprise_linux:7::client | Package registry (OSV) |
| red hat:nss-debuginfo | 0:3.53.1-3.el7_9 · Red Hat:enterprise_linux:7::client | Package registry (OSV) |
| red hat:nss-softokn | 0:3.53.1-6.el7_9 · Red Hat:enterprise_linux:7::client | Package registry (OSV) |
| red hat:nss-softokn-debuginfo | 0:3.53.1-6.el7_9 · Red Hat:enterprise_linux:7::client | Package registry (OSV) |
| red hat:nss-softokn-freebl | 0:3.53.1-6.el7_9 · Red Hat:enterprise_linux:7::client | Package registry (OSV) |
| red hat:nss-sysinit | 0:3.53.1-3.el7_9 · Red Hat:enterprise_linux:7::client | Package registry (OSV) |
| red hat:nss-tools | 0:3.53.1-3.el7_9 · Red Hat:enterprise_linux:7::client | Package registry (OSV) |
| red hat:nss-util | 0:3.53.1-1.el7_9 · Red Hat:enterprise_linux:7::client | Package registry (OSV) |
| red hat:nss-util-debuginfo | 0:3.53.1-1.el7_9 · Red Hat:enterprise_linux:7::client | Package registry (OSV) |
| rocky linux:nss | 0:3.53.1-17.el8_3 · Rocky Linux:8 | Package registry (OSV) |
| suse:mozilla-nspr | 4.32-33.6.1 · SUSE:Linux Enterprise Point of Sale 11 SP3 | Package registry (OSV) |
| suse:mozilla-nss | 3.68-47.16.1 · SUSE:Linux Enterprise Point of Sale 11 SP3 | Package 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.
Not on record for this CVE: EPSS history · patch commit or PR link · researcher credit · variant or chain candidate · public bounty program.
Technical details
Attack conditions
- Someone with local access to the system can trigger it.
- A low-privileged account is enough.
- No user action is required.
- Special conditions such as timing or configuration are required.
If successful
- Confidentiality
- high · data can be read
- Integrity
- none
- Availability
- none
- Attack vector
- Local
- Attack complexity
- High
- Privileges required
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- High
- Integrity impact
- None
- Availability impact
- None
Weakness class (CWE)
CWE-203 · Observable DiscrepancyCVSS vector
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
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.
Attack patterns (CAPEC)
ATT&CK techniques
—
Change log (1)
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
Show all references (3 more)Show less
Vendor advisories and official records. Exploit/PoC links are deliberately left out.