CVE-2026-27750Disclosure(avira / internet_security)

LOWCVSS 7.0 · HIGH

Exploit discussion active in current signal (1 latest mentions)

Immediate actions

Hunt for exploitation attempts and persistence artifacts
Increase monitoring for publicly documented tradecraft
Track advisory updates for patch or workaround availability

Recommended action window: High priority (within 72h)

NVD description

Avira Internet Security contains a time-of-check time-of-use (TOCTOU) vulnerability in the Optimizer component. A privileged service running as SYSTEM identifies directories for cleanup during a scan phase and subsequently deletes them during a separate cleanup phase without revalidating the target path. A local attacker can replace a previously scanned directory with a junction or reparse point before deletion occurs, causing the privileged process to delete an unintended system location. This may result in deletion of protected files or directories and can lead to local privilege escalation, denial of service, or system integrity compromise depending on the affected target.

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1.5/ 10 priority

Sources & remediation

Other references

Weakness type (CWE)

CWE-367

Priority

LOW

Exploitation

NONE

PoC

YES

Patch

NONE

Momentum

STABLE

Are you affected?

If you run products in this scope, you should treat this CVE as relevant to your environment.

internet_security

Threat summary

Public PoC is present in monitored signal
3 mentions across 3 observed days
Momentum state: stable

What's happening

PoC mentioned or linked in 2 signals
Technical details provided in 3 signals
Disclosure: 2 classified signals
Peaked 2d ago at 1 mentions (2026-03-03); latest day: 1
3 total mentions across 3 days

Affected systems

Vendors

avira

Products

internet_security

Deep dive

Activity timeline3 mentions / 3d

Signal classification2 categories

Disclosure

266.7%

PoC

133.3%

Referenced assets2 URLs

By indicator

Classification over time

Date	Total	Labels

2026-03-03	1	Disclosure1
2026-03-04	1	PoC1
2026-03-05	1	Disclosure1

Full discourse3 posts

quarkslab@quarkslab221d
Disclosure
Another antivirus 🛡️, another unfulfilled promise 😣. @kaluche_ turns Avira's protection into a privilege escalation playground. 3 LPE vectors via symlink abuse (CVE-2026-27748, CVE-2026-27750) and unsafe deserialization (CVE-2026-27749). Find out more: https://blog.quarkslab.com/avira-deserialize-delete-and-escalate-the-proper-way-to-use-an-av.html https://t.co/aipOEFZqnE
Post summary
Quarkslab’s blog post discloses three new Avira privilege‑escalation vulnerabilities involving symlink abuse and unsafe deserialization; no patches or active exploitation are reported, but technical details are provided.
3381132449.3K
12.2K followersView on X
Vulmon Vulnerability Feed@VulmonFeeds219d
Disclosure
CVE-2026-27750 Avira Internet Security Optimizer TOCTOU Vulnerability Enables Privileged File Deletion https://vulmon.com/vulnerabilitydetails?qid=CVE-2026-27750
Post summary
The post announces a new TOCTOU vulnerability (CVE-2026-27750) in Avira Internet Security Optimizer that could allow privileged file deletion, with no exploit, PoC, or mitigation details disclosed.
0000037
4.0K followersView on X
Autumn Good@autumn_good_35220d
PoC
CVE-2026-27748: Arbitrary file delete CVE-2026-27749: LPE via insecure deserialization CVE-2026-27750: LPE via TOCTOU folder delete Avira: Deserialize, Delete and Escalate - The Proper Way to Use an AV - Quarkslab's blog https://blog.quarkslab.com/avira-deserialize-delete-and-escalate-the-proper-way-to-use-an-av.html
Post summary
The blog post discusses three Avira CVEs—arbitrary file deletion and two local privilege escalation vectors—providing proof‑of‑concept details for each.
00000356
6.7K followersView on X

CPE platform detail1 entries

Part:

Vendor:

Product:

Version:

Target SW:

Target HW:

1 of 1 entries

Part	Vendor	Product	Version	Target SW	Target HW
App	avira	internet_security	-	windows	-

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