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CVE-2021-43957

25
FAUCET Score

CVE-2021-43957 is an Insecure Direct Object References (IDOR) vulnerability affecting Atlassian Fisheye and Crucible versions prior to 4.8.9. This flaw allows remote attackers to bypass a previous fix (CVE-2020-29446) and browse local files within the WEB-INF directory due to a lack of URL decoding. With a CVSS score of 7.5 (High), it presents a significant risk as it can be exploited remotely without authentication, leading to high confidentiality impact. There is currently no evidence of active exploitation, public exploit code, or significant community discussion surrounding this vulnerability.

Impacted Technologies

VendorProductVersion(s)CPE
< 4.8.9CPE matchmatch criteria
cpe:2.3:a:atlassian:crucible:*:*:*:*:*:*:*:*
< 4.8.9CPE matchmatch criteria
cpe:2.3:a:atlassian:fisheye:*:*:*:*:*:*:*:*

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
1.27%
Probability of exploitation in next 30 days
EPSS Percentile
66.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0127 is in the 46th percentile among its peer group of 51,551 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

jira.atlassian.com / browse/CRUC-8524
Issue TrackingVendor Advisory
jira.atlassian.com / browse/FE-7388
Issue TrackingVendor Advisory