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CVE-2021-29499

23
FAUCET Score

CVE-2021-29499 affects the Singularity Image Format (SIF) implementation, specifically the sylabs singularity_image_format, due to predictable UUID generation in the siftool new command and siftool.New() function. This vulnerability, rated High severity (CVSS 7.5), stems from insecure randomness in a dependency, allowing an unauthenticated attacker to achieve high confidentiality impact with low attack complexity. There is currently no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
< 1.2.3CPE matchmatch criteria
cpe:2.3:a:sylabs:singularity_image_format:*:*:*:*:*:*:*:*

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
0.96%
Probability of exploitation in next 30 days
EPSS Percentile
57.8%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
This CVE's current EPSS score of 0.0096 is in the 32nd 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 (1)

gopatch availablevia ghsa
Product: github.com/sylabs/sifFixed in: 1.2.3

Vendor Advisories (1)

goGHSA-4gh8-x3vv-phhghigh

Predictable SIF UUID Identifiers in github.com/sylabs/sif

May 18, 2021

References

github.com / sylabs/sif/security/advisories/GHSA-4gh8-x3vv-phhg
ExploitThird Party Advisory