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CVE-2021-29455

19
FAUCET Score

CVE-2021-29455 describes a vulnerability in the Grassroot Platform, specifically affecting versions prior to master deployment as of 2021-04-16. The flaw allowed attackers to forge valid JSON Web Tokens (JWTs) due to improper signature verification during the token refresh process. This medium-severity vulnerability (CVSS 5.3) could lead to unauthorized access (integrity impact of low, no confidentiality or availability impact) with low attack complexity and no user interaction required. There is no evidence of active exploitation, no public exploit code available, and minimal community discussion or media coverage surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
< 1.3.1CPE matchmatch criteria
cpe:2.3:a:grassroot:grassroot_platform:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

7.5HIGH

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.76%
Probability of exploitation in next 30 days
EPSS Percentile
51.4%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0076 is in the 32nd percentile among its peer group of 23,705 CVEs.

Social Chatter

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

Media Mentions

No media coverage found for this CVE.

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

Remediation

Patch Available

Vendor Patches (1)

github_advisorypatch availablevia nvd_reference
View patch

References

github.com / grassrootza/grassroot-platform
ProductThird Party Advisory
github.com / grassrootza/grassroot-platform/commit/a2e6e885f8183a066d938cf909fd813a7af7d67f
PatchThird Party Advisory
github.com / grassrootza/grassroot-platform/security/advisories/GHSA-f65w-6xw8-6734
Third Party Advisory