CVE-2022-24682

An issue was discovered in the Calendar feature in Zimbra Collaboration Suite 8.8.x before 8.8.15 patch 30 (update 1), as exploited in the wild starting in December 2021. An attacker could place HTML containing executable JavaScript inside element attributes. This markup becomes unescaped, causing arbitrary markup to be injected into the document.

CVSS: 6.1Mediumscored by CISA
Exploited in the wild: Yes, in CISA KEV since 25 Feb 2022CISA deadline for US federal agencies: 11 Mar 2022known use in ransomware campaigns
EPSS: 30.9%chance of exploitation in the next 30 daystop 2% of scored CVEsFIRST score of 11 Nov 2026
Fix: Patch availablesee the advisories in the references
Published: 9 Feb 2022analysed here 12 Nov 2026

Do first. Apply updates per vendor instructions. (CISA's required action for this KEV entry)

Summary

Triage

Exploitable: At runtime
Attack vector: network
Weakness: CWE-116 Common Weakness
Can a WAF block it?: Partly. See why

The summary, impact and action text on this page are written by our AI analysis pipeline, or taken from the NVD description when a CVE was imported from NVD. They are not the vendor's wording: check them against the sources. A longer AI executive summary and technical analysis are generated for signed-in accounts on the Max plan.

Affected products

Products named in our analysis

synacor:zimbra_collaboration_suite

Fix and mitigation

WAF and other mitigations

Can a WAF block it? Partly. The bug can be reached over the network, so generic WAF rules may stop some attacks. Its weakness type is unknown, so we cannot be more precise.

Also consider: patch

Based on the weakness type only; no CVE-specific evidence yet. We check Cloudflare, AWS, Google Cloud Armor and Azure; for Akamai, Imperva, Fastly, F5, ask your vendor.

Remediation steps (AI-written)

Step-by-step remediation is generated for accounts on the Max plan, for CVEs that match a technology in their stack. Add this technology to your stack to see the fix checklist.

Exploitation evidence

CISA KEV catalog: Listed since 25 Feb 2022. Known use in ransomware campaigns.
CISA due date: 11 Mar 2022, the remediation deadline for US federal agencies
CISA required action: Apply updates per vendor instructions.
Public exploit code: Detection templates only, no public exploit found: 1 Nuclei template
CISA SSVC: exploitation active, automatable no, technical impact partialAssessed by CISA 4 Feb 2022 (SSVC 2.0.3). Exploitation is none, poc (public proof of concept) or active.

Nuclei

Zimbra Collaboration Suite < 8.8.15 - Improper Encodingdetection template, medium

Listed so you can judge urgency, not as a recommendation to run anything. GitHub “proofs of concept” are unvetted: some are fake or carry malware. Exploit-DB marks the entries its staff verified.

Timeline

4 Feb 2022CISA SSVC assessment: exploitation active
9 Feb 2022Published5 days later
25 Feb 2022Added to CISA KEV (exploited in the wild)16 days later
11 Mar 2022CISA remediation due date (US federal agencies)14 days later
7 Aug 2026CVE record last updated1,610 days (about 4 years) later
12 Nov 2026Analysed by vulneraibility.com97 days (about 3 months) later

CVSS vector

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

Metric	Value	What it means
Attack vector	NetworkReachable over the internet or any routable network.	Reachable over the internet or any routable network.
Attack complexity	LowRepeatable attack, no special conditions.	Repeatable attack, no special conditions.
Privileges required	NoneThe attacker needs no prior access.	The attacker needs no prior access.
User interaction	RequiredA victim must click, open or otherwise cooperate.	A victim must click, open or otherwise cooperate.
Scope	ChangedImpact crosses a security boundary into other components.	Impact crosses a security boundary into other components.
Confidentiality	LowPartial data disclosure.	Partial data disclosure.
Integrity	LowLimited modification possible.	Limited modification possible.
Availability	NoneThe service stays up.	The service stays up.

Common questions

Is CVE-2022-24682 being exploited?

Yes. CVE-2022-24682 appears in CISA's Known Exploited Vulnerabilities catalog, which means exploitation in the wild has been confirmed and reported. Treat it as active rather than theoretical, and patch it ahead of higher-scoring vulnerabilities that carry no exploitation evidence.

How severe is CVE-2022-24682?

CVE-2022-24682 is rated Medium with a CVSS score of 6.1. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.

Is there a patch for CVE-2022-24682?

Yes. A fix has been recorded for CVE-2022-24682. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.

What does CVE-2022-24682 affect?

CVE-2022-24682 affects synacor:zimbra_collaboration_suite. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.

Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.

References

NVD CVE.org CVE Details Source

6 references in the CVE record, grouped by the tags the record gives them.

Where the data on this page comes from

CVE List (CVE.org): description, affected versions, references; CVE Terms of Use
NVD: CVSS and CPE data
CISA KEV catalog: exploitation, date added, due date
CISA Vulnrichment (ADP): SSVC decision points
FIRST EPSS: exploit probability and percentile
Nuclei templates: detection templates

Summary, impact and triage tags: written by our AI analysis pipeline from the sources above. Check them against the sources.

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