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CVE-2020-1959

33
FAUCET Score

CVE-2020-1959 is a critical Server-Side Template Injection vulnerability affecting Apache Syncope versions prior to 2.1.6. This flaw allows unauthenticated attackers to inject arbitrary Java EL expressions, leading to Remote Code Execution (RCE). With a CVSS score of 9.8, the vulnerability is easily exploitable over the network with no user interaction, granting full control over the affected system. Despite its severity, there is currently no public exploit code available (Metasploit, Nuclei, ExploitDB), and it is not listed in the KEV catalog, indicating no known active exploitation. Community discussion and media coverage are also minimal.

Impacted Technologies

VendorProductVersion(s)CPE
>= 2.1.0, < 2.1.6CPE matchmatch criteria
cpe:2.3:a:apache:syncope:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

9.8CRITICAL

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
4.82%
Probability of exploitation in next 30 days
EPSS Percentile
91.0%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
This CVE's current EPSS score of 0.0482 is in the 85th percentile among its peer group of 36,833 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (1)

mavenpatch availablevia ghsa
Product: org.apache.syncope:syncope-coreFixed in: 2.1.6

Vendor Advisories (1)

mavenGHSA-vjqw-r3ww-wj2wcritical

Expression Language Injection in Apache Syncope

Jun 16, 2021

References

syncope.apache.org / security
Vendor Advisory