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CVE-2021-4286

25
FAUCET Score

CVE-2021-4286 is a problematic information exposure vulnerability affecting cocagne pysrp versions up to 1.0.16, specifically within the calculate_x function of srp/_ctsrp.py. This vulnerability has a CVSS score of 7.5 (HIGH), indicating it can be exploited remotely with low attack complexity, leading to high confidentiality impact without requiring user interaction. There is currently no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
< 1.0.17CPE matchmatch criteria
cpe:2.3:a:pysrp_project:pysrp:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

2.6LOW

CVSS:3.1/AV:A/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N

Attack Vector
ADJACENT_NETWORK
Attack Complexity
HIGH
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
LOW
Integrity Impact
NONE
Availability Impact
NONE
Exploitability Score
1.2
Impact Score
1.4
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.70%
Probability of exploitation in next 30 days
EPSS Percentile
49.6%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0070 is in the 26th percentile among its peer group of 51,485 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (2)

github_advisorypatch availablevia nvd_reference
View patch
pippatch availablevia ghsa
Product: srpFixed in: 1.0.17

Vendor Advisories (1)

pipGHSA-xmc3-9m9j-w9x4high

cocagne pysrp vulnerable to side channel leaks

Dec 27, 2022

References

github.com / cocagne/pysrp/commit/dba52642f5e95d3da7af1780561213ee6053195f
PatchThird Party Advisory
github.com / cocagne/pysrp/pull/43
PatchThird Party Advisory
github.com / cocagne/pysrp/releases/tag/1.0.17
Release NotesThird Party Advisory
vuldb.com
Third Party Advisory
vuldb.com
Third Party Advisory