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CVE-2021-28373

24
FAUCET Score

CVE-2021-28373 describes a critical authentication bypass vulnerability in the auth_internal plugin of Tiny Tiny RSS (tt-rss) versions prior to 2021-03-12. An attacker could log in using only an OTP code, bypassing the need for a valid password. This vulnerability has a CVSS score of 7.5 (High), indicating it can be exploited remotely with low complexity and results in high integrity impact, allowing unauthorized access. While the issue was present in the git master branch for a short period, tt-rss users are directed to use this branch in production, making it a relevant concern. There is currently no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
< 2021-03-12CPE matchmatch criteria
cpe:2.3:a:tt-rss:tiny_tiny_rss:*:*:*:*:*:*:*:*

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:N/I:H/A:N

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

Exploit Intelligence

EPSS Score
0.93%
Probability of exploitation in next 30 days
EPSS Percentile
57.1%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0093 is in the 32nd percentile among its peer group of 51,506 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

Remediation records are not available for this CVE.

References

community.tt-rss.org / t/check-password-not-called-if-otp-is-enabled-update-asap-if-youre-using-2fa/4502
Issue TrackingPatchVendor Advisory
git.tt-rss.org / fox/tt-rss/commit/4949e1a59059d9e72ba7a98f783cec312c06c6d2
PatchThird Party Advisory