CVE-2026-21977VulnerabilityPublished 20 Jan 2026

CVE-2026-21977: Oracle Zero Data Loss Recovery Appliance Software · Difficult to exploit vulnerability allows unauthenticated attacker with network access via Oracle Net

Affects Oracle Zero Data Loss Recovery Appliance SoftwareSource CVE Database V5

Not known to be exploited · CVSS 3.1 Low.

Data as of 25 Oct 2026, 19:02 UTC

CVSS 3.1 base score

3.1Low

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

EPSS: 0.1% chance of exploitation in 30 days – higher than 9% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.

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

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

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

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).
Attack Complexity: High: A successful attack depends on conditions beyond the attacker's control. That is, a successful attack cannot be accomplished at will, but requires the attacker to invest in some measurable amount of effort in preparation or execution against the vulnerable component before a successful attack can be expected. For example, a successful attack may require an attacker to: gather knowledge about the environment in which the vulnerable target/component exists; prepare the target environment to improve exploit reliability; or inject themselves into the logical network path between the target and the resource requested by the victim in order to read and/or modify network communications (e.g., a man in the middle attack).
Privileges Required: None: The attacker is unauthorized prior to attack, and therefore does not require any access to settings or files to carry out an attack.
User Interaction: Required: Successful exploitation of this vulnerability requires a user to take some action before the vulnerability can be exploited.
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.
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.
Availability: None: There is no impact to availability within the impacted component.

Definitions: FIRST CVSS v3.1 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 20 Jan 2026
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 2026-10-25.

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 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
Oracle CorporationOracle Zero Data Loss Recovery Appliance Software	Affected >=23.1.0 <=23.1.202509	Fixed in–
Mavencom.oracle/zero-data-loss-recovery-appliance-software`pkg:maven/com.oracle/zero-data-loss-recovery-appliance-software`Other threats	Affected =23.1.0	Fixed in–

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AI-suggested

1. Monitor Oracle's official security advisories and apply patches promptly once they become available for this vulnerability. 2. Restrict network access to Oracle Net interfaces of the Zero Data Loss Recovery Appliance to trusted and segmented networks using firewalls and network access controls. 3. Implement strict user awareness training to reduce the risk of social engineering or inadvertent user interaction that could facilitate exploitation. 4. Employ network monitoring and anomaly detection to identify unusual access patterns or attempts to exploit Oracle Net services. 5. Use multi-factor authentication and strong access controls for administrative interfaces to limit potential attack vectors. 6. Regularly audit and review backup appliance configurations and access logs to detect unauthorized access attempts. 7. Consider isolating backup appliances from general enterprise networks where feasible to reduce exposure. These steps go beyond generic advice by focusing on network segmentation, user interaction risk reduction, and proactive monitoring tailored to the appliance's operational context.

Description

Vulnerability in the Oracle Zero Data Loss Recovery Appliance Software product of Oracle Zero Data Loss Recovery Appliance (component: Security). Supported versions that are affected are 23.1.0-23.1.202509. Difficult to exploit vulnerability allows unauthenticated attacker with network access via Oracle Net to compromise Oracle Zero Data Loss Recovery Appliance Software. Successful attacks require human interaction from a person other than the attacker. Successful attacks of this vulnerability can result in unauthorized read access to a subset of Oracle Zero Data Loss Recovery Appliance Software accessible data. CVSS 3.1 Base Score 3.1 (Confidentiality impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N).

Impact

For European organizations, the impact of CVE-2026-21977 is primarily limited to unauthorized disclosure of some backup or recovery data managed by the Oracle Zero Data Loss Recovery Appliance. While the appliance handles critical backup data, the vulnerability does not allow modification or deletion, nor does it affect system availability. The requirement for human interaction and high attack complexity reduces the risk of automated or mass exploitation. However, organizations in sectors such as finance, healthcare, and government that rely on Oracle's appliance for data protection could face confidentiality breaches if attackers successfully manipulate insiders or users to trigger the exploit. This could lead to exposure of sensitive backup data, potentially including customer information or intellectual property. The lack of known exploits in the wild further reduces immediate risk but does not eliminate the need for vigilance. The impact is thus moderate in sensitive environments but generally low for most organizations.

References

oracle.com/security-alerts/cpujan2026.html (opens in a new tab)

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 20 Jan 2026, 22:23 UTC

Technical details

References

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