Weak Cryptography in SAP NetWeaver and ABAP Platform (Application Server ABAP)
- Exploited
- No known exploitation
- Fix
- No fix listed
- Who is exposed
- Not reported
- Last modified
- Whether it needs action now or is a reference record, by fixed rules, with why. Last checked is when cve.now last re-read it.What do these mean? →
- Reference
- Last checked
- FIRST's estimate of the chance attackers exploit it in the next 30 days, updated daily.What do these mean? →
- 0.13% · 2nd percentile
- A 0-100 score for how much a CVE matters across the industry: exploitation, exposure, how widely the software is used, severity and whether a fix exists.What do these mean? →
- 12/100 · provisional
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
- Exploitation: none
- Automatable: no
- Technical impact: total
Summary
SAP NetWeaver and ABAP Platform (Application Server ABAP) contains a weak HMAC calculation when receiving RFC callbacks, which lets an attacker with high privileges on a network segment between application servers intercept traffic, impersonate the caller, and run unauthorized function calls with escalated privileges. Exploitation requires adjacent network access and high-privilege authentication, and it affects confidentiality, integrity, and availability.
Written by anthropic/claude-haiku-5.5 from the sources below. Verify against them.
Read the original description
Due to a weak HMAC cryptography calculation when receiving an RFC callback in SAP NetWeaver and ABAP Platform (Application Server ABAP), an authenticated attacker with high privileges and access to a network segment between application servers on an SAP system could intercept network communication between application servers and change the identity of the caller, enabling the execution of unauthorized function calls on the target server with escalated privileges leading to High impact on Confidentiality, Integrity, and Availability of the application.
cve.now Index
- Exploitation0/40No signal
- Exposure?/25Unknown. No advisory context yet
- Reach?/20Unknown. No tracked technology or package matched
- Severity7.4/10CVSS 6.4, total technical impact per CISA
- No patch5/5No patch listed yet
What would change the score
- Would score about 67 if added to CISA KEV
- Would score about 62 if CISA's SSVC rates exploitation active
- Would score about 34 if advisories confirm default setups are exposed
Check your systems with an agent
Paste this into a coding or ops agent. It checks your systems read-only and reports a table per asset.
Check whether my systems are affected by CVE-2026-109805 (Weak Cryptography in SAP NetWeaver and ABAP Platform (Application Server ABAP)), using the cve.now data below. Rules: work read-only. Do not run exploit code, proof-of-concept scripts or scanners that send attack payloads, and do not change any configuration, package, image or deployment. Report findings only. What cve.now has for CVE-2026-109805 (entry last updated 2026-11-10): Affected: - SAP_SE SAP NetWeaver and ABAP Platform (Application Server ABAP): versions KRNL64NUC 7.22, 7.22EXT, KRNL64UC 7.22, 7.53, KERNEL 7.22, 7.54, 7.77, 7.93, 9.16, 9.20, 9.21 Fixed versions: none listed yet. Setup: unknown whether the bug needs a non-default feature or setting. Check the advisory. CISA KEV: CVE-2026-109805 is not listed as of cve.now's last read. This KEV status is for CVE-2026-109805 only. If you also check another CVE, look up its own KEV status; never assume it from this one. How to check: - Installed software: check what is actually running, not what a repo declares. Read the version from each host, container image and Kubernetes node (the binary's version output, the OS package database, image layers), and check whether the conditions above hold there. Distribution packages may carry a backported fix under an older version number; confirm against the distribution's own advisory. Verify against the linked advisories before concluding, and cite the date you read each one: - https://me.sap.com/notes/3786876 - https://url.sap/sapsecuritypatchday Do not conclude an asset is unaffected unless you checked it and the evidence covers both its version and the conditions above. If you could not check something, mark it unknown and say what is missing. Report a table with one row per asset and these columns: Asset | Version or build | Status (affected, fixed, not applicable, unknown) | Compensating controls | Exposure (internet-facing, internal, none) | Evidence | Next action. Entry: https://cve.now/CVE-2026-109805 For follow-up questions, use the cve.now MCP server at https://mcp.cve.now/mcp (no authentication), for example get_vulnerability with id CVE-2026-109805.
Timeline
- CVE published
- First seen by cve.now
- CISA SSVC assessment
Exploitation: none · Automatable: no · Technical impact: total
- Record last updated
Affected versions
- SAP_SE SAP NetWeaver and ABAP Platform (Application Server ABAP)
KRNL64NUC 7.22, 7.22EXT, KRNL64UC 7.22, 7.53, KERNEL 7.22, 7.54, 7.77, 7.93, 9.16, 9.20, 9.21
Evidence 4
CVE record · 2
Establishes: The identifier and description.
- Record
- Record
Other links · 1
- Link
Corrections
None so far.
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Questions about CVE-2026-109805
Is CVE-2026-109805 being exploited?
It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked.Source: cve.now feed data
Which versions are affected by CVE-2026-109805?
SAP NetWeaver and ABAP Platform (Application Server ABAP): versions KRNL64NUC 7.22, 7.22EXT, KRNL64UC 7.22, 7.53, KERNEL 7.22 and 6 more.Source: cve.now feed data