VulnerabilityPublished 29 Sep 2020Updated 30 May 2025

CVE-2020-15594: Zoho Application Control Plus · An SSRF Issue Was Discovered

Source CVE Database V5

Not known to be exploited · CVSS 4.3 Medium · fixed in 10.0.511 : update affected systems when convenient.

Data as of 26 Oct 2026, 14:05 UTC

CVSS 3.1 base score

4.3Medium

How severe the flaw is on the 0–10 CVSS scale.

EPSS: 1.7% chance of exploitation in 30 days – higher than 78% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in 10.0.511

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

Attack Complexity: Low
Attack Vector: Network
Availability: None
Confidentiality: Low
Integrity: None
Privileges Required: Low
Scope: Unchanged
User Interaction: None

Bold values are the worst case: easiest to exploit or largest impact.

Attack Complexity: Low: Specialized access conditions or extenuating circumstances do not exist. An attacker can expect repeatable success against the vulnerable component.
Attack Vector: Network: The vulnerable component is bound to the network stack and the set of possible attackers extends beyond the other options listed, up to and including the entire Internet. Such a vulnerability is often termed 'remotely exploitable' and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers).
Availability: None: There is no impact to availability within the impacted component.
Confidentiality: Low: There is some loss of confidentiality. Access to some restricted information is obtained, but the attacker does not have control over what information is obtained, or the amount or kind of loss is limited. The information disclosure does not cause a direct, serious loss to the impacted component.
Integrity: None: There is no loss of integrity within the impacted component.
Privileges Required: Low: The attacker is authorized with (i.e., requires) privileges that provide basic user capabilities that could normally affect only settings and files owned by a user. Alternatively, an attacker with Low privileges may have the ability to cause an impact only to non-sensitive resources.
Scope: Unchanged: An exploited vulnerability can only affect resources managed by the same security authority. In this case, the vulnerable component and the impacted component are either the same, or both are managed by the same security authority.
User Interaction: None: The vulnerable system can be exploited without any interaction from any user.

Definitions: FIRST CVSS v3.1 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 29 Sep 2020
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Affected software

Product	Affected	Fixed in
n/a n/a	Affected <10.0.511	Fixed in 10.0.511

AI-suggested

To mitigate this vulnerability, European organizations should prioritize updating Zoho Application Control Plus to version 10.0.511 or later, where the issue is resolved. In the absence of immediate patching, organizations should restrict access to the mail gateway configuration feature to trusted administrators only, enforcing strict access controls and monitoring for unusual activity. Network segmentation should be enhanced to limit the application's ability to scan sensitive internal network segments. Implementing network-level controls such as firewall rules to restrict outbound requests from the application server can reduce the attack surface. Additionally, organizations should audit and monitor authentication logs for suspicious access patterns, especially from accounts with low privilege that could exploit this vulnerability. Regular vulnerability scanning and penetration testing should include checks for SSRF vulnerabilities to detect similar issues proactively. Finally, educating administrators about the risks of SSRF and the importance of timely patching will help maintain a strong security posture.

Description

An SSRF issue was discovered in Zoho Application Control Plus before version 10.0.511. The mail gateway configuration feature allows an attacker to perform a scan in order to discover open ports on a machine as well as available machines on the network segment on which the instance of the product is deployed.

Impact

For European organizations using Zoho Application Control Plus, this vulnerability poses a moderate risk primarily related to information disclosure. The ability to perform internal network scanning can reveal critical infrastructure details such as open ports and active hosts, which attackers can leverage to plan targeted attacks, including lateral movement or exploitation of other vulnerabilities within the network. This is particularly concerning for organizations with sensitive internal networks, such as financial institutions, healthcare providers, and critical infrastructure operators. While the vulnerability does not directly compromise data integrity or availability, the reconnaissance capability can be a stepping stone for more severe attacks. The requirement for low privilege authentication reduces the likelihood of exploitation by external unauthenticated attackers but does not eliminate risk from insider threats or compromised accounts. European organizations with segmented or sensitive internal networks may face increased risk if attackers gain access to the application. Additionally, the lack of known public exploits suggests that proactive mitigation can effectively reduce risk before exploitation becomes widespread.

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 8 Jul 2025, 15:10 UTC

Technical details

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