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CVE-2021-29443

21
FAUCET Score

CVE-2021-29443 is a padding oracle vulnerability affecting the jose npm library, specifically in its AES_CBC_HMAC_SHA2 decryption implementation. An attacker could exploit a timing difference during padding errors to decrypt data without the key. This vulnerability has a CVSS score of 5.9 (Medium) due to its network attack vector and high impact on confidentiality, though it requires high attack complexity. There is no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
>= 1.0.0, < 1.28.1CPE matchmatch criteria
cpe:2.3:a:panva:jose:*:*:*:*:*:node.js:*:*
>= 2.0.0, < 2.0.5CPE matchmatch criteria
cpe:2.3:a:panva:jose:*:*:*:*:*:node.js:*:*
>= 3.0.0, < 3.11.4CPE matchmatch criteria
cpe:2.3:a:panva:jose:*:*:*:*:*:node.js:*:*

CVSS Data

CVSS version used by this source: 3.1

5.9MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
Exploitability Score
2.2
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.17%
Probability of exploitation in next 30 days
EPSS Percentile
64.1%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0117 is in the 28th percentile among its peer group of 19,958 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.2 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 (4)

github_advisorypatch availablevia nvd_reference
View patch
npmpatch availablevia ghsa
Product: joseFixed in: 1.28.1
npmpatch availablevia ghsa
Product: joseFixed in: 2.0.5
npmpatch availablevia ghsa
Product: joseFixed in: 3.11.4

Vendor Advisories (1)

npmGHSA-58f5-hfqc-jgchmedium

Padding Oracle Attack due to Observable Timing Discrepancy in jose

Apr 19, 2021

References

github.com / panva/jose/security/advisories/GHSA-58f5-hfqc-jgch
PatchThird Party Advisory
npmjs.com / package/jose
Third Party Advisory